Foreign Secretary Yvette Cooper has condemned their sentence as "completely appalling and totally unjustifiable".
"We will pursue this case relentlessly with the Iranian government until we see Craig and Lindsay Foreman safely returned to the UK and reunited with their family," she said.
Joe Bennett, Lindsay Foreman's son, told Sky News' Jason Farrell he had spoken with the couple since their sentencing, describing how they reacted to the news with a "kind of mass panic".
He said the prison sentence left him with a "pit in the stomach", describing how "I felt sick, [I] didn't sleep".
The couple were arrested in January 2025 while travelling through the country on an around-the-world motorcycle journey and detained on charges of espionage.
The Foremans, from East Sussex, who are being held in Tehran's Evin prison, deny the allegations.
The couple's family says the sentence places the case "in line with the most severe politically motivated detentions of UK nationals in Iran".
Mr Bennett said the couple had been "sentenced to 10 years following a trial that lasted just three hours and in which they were not allowed to present a defence".
"They have consistently denied the allegations. We have seen no evidence to support the charge of espionage," he added.
The sentence follows a court appearance on 27 October 2025 before Judge Abolghasem Salavati at Branch 15 of the Islamic Revolutionary Court in Tehran.
Judge Salavati has previously been sanctioned by the UK, US and EU in connection with human rights violations and the conduct of trials criticised internationally for lack of due process.
Ahead of his sentencing, Mr Foreman described being held in an "eight-foot cell with a hole in the floor and a sink" and described the effects of 57 days in solitary confinement, saying: "Emotionally and physically, it broke me to pieces".
He said that once a month, meetings with his wife are what sustain him.
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Mr Bennett said the couple had "already spent more than 13 months in detention". "We are deeply concerned about their welfare and about the lack of transparency in the judicial process," he added.
He told Jason Farrell that the couple's family had received a call straight away from Foreign Office minister Hamish Falconer, who was "quite forceful in the fact that he was going to pick it up with his counterparts".
Mr Bennett also welcomed Ms Cooper's statement, saying he had already noticed a "different tone... from the government and that's only been within 24 hours".
"For the first time, there's a sentence that the government can now act on, which is what they've been asking for for the last 14 months," he added.
The Foreign Office is currently warning people not to travel to Iran, because of "the significant risk of arrest, questioning or detention". "The UK government will not be able to help you if you get into difficulty in Iran," it has cautioned.
Iran has arrested dozens of foreign visitors and dual nationals in recent years, mostly on espionage and security-related charges.
Human rights groups and some Western countries have accused Iran of trying to win concessions from other nations through arrests on trumped-up charges.
British-Iranian dual nationals like Nazanin Zaghari-Ratcliffe and Anoosheh Ashoori are among those who have spent years behind bars in Iran before diplomatic negotiations helped secure their release.
The sentencing of the Foremans comes amid heightened tensions in the region following a deadly crackdown on a wave of demonstrations in Iran.
US President Donald Trump last month urged Iranian protesters - thousands of whom have been killed by the regime's forces - to keep demonstrating and promised that "help is on the way".
A powerful US military force continues to assemble within striking distance of Iran.
Police were called to Little Eden Holiday Park in Bridlington on Wednesday, where a 15-year-old girl and a 17-year-old boy were found dead inside one of the rental properties.
A 33-year-old man was arrested on Thursday on suspicion of gross negligence manslaughter and remains in custody, police said.
Chief Superintendent Matt Peach of Humberside Police said: "Whilst we are in the very early stages and the deaths at this time remain unexplained, we are exploring the possibility that they may be connected to carbon monoxide poisoning, with further enquiries continuing with our partner agencies."
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Mr Peach said a cordon remains in place, adding police are "working closely with Humberside Fire & Rescue, the Health and Safety Executive, and East Riding of Yorkshire Council to establish the full circumstances surrounding the incident".
He said: "This is incredibly distressing and heartbreaking for the families of the teenagers involved, and they are at the forefront of our minds and actions.
"Specially trained officers have been supporting the families over the last 24 hours, and I would please ask people to refrain from any form of speculation and to respect their privacy.
"We have a dedicated team conducting extensive enquiries, some of which have been complex and required additional time to complete."
Owen Maughan, 27, had previously pleaded guilty to the manslaughter of the child, Peter Maughan, on 1 June last year following the collision on New Barn Road in Dartford in Kent.
The defendant's father Patrick, 54, who was in the vehicle with his son, was found guilty of manslaughter in the trial at Maidstone Crown Court, but was also cleared of murder.
The jury heard the pair were "in a fury" as they pursued a Ford pick-up truck for several miles down the A2 in Kent.
They had been drinking heavily earlier in the day.
Owen Maughan drove into the wrong lane and clipped the rear of the pick-up at about 60mph, causing it to roll over multiple times, the court heard.
Prosecutor Richard Jory KC had told the jury the action was "a deliberate ramming at high speed", and that Owen Maughan had "used his car as a weapon to ram the other vehicle off the road".
Peter Maughan was in the back of the truck with his one-year-old sister Annarica, while their mother Hayley, Owen Maughan's cousin, was in the front passenger seat. Her partner, Lovell Mahon, was driving.
Peter was thrown from the vehicle, and suffered "severe and devastating injuries" to his head, chest and abdomen, while Mr Mahon sustained injuries including a fractured skull and is unlikely to ever walk again.
Owen Maughan also previously pleaded guilty to causing serious injury by dangerous driving and inflicting grievous bodily harm on Mr Mahon. The jury found Patrick Maughan was also guilty of inflicting grievous bodily harm.
Jurors were told Maughan and his father had been drinking in Rochester earlier that day, consuming about 12 bottles of beer and 13 pints respectively, before they began driving their pick-up truck home.
Hayley Maughan filmed video clips of the two men following them, leaving a voice note for her mother Erica in which she said she was afraid.
In his evidence, Owen Maughan said he did not know there were children in the other car, and "couldn't believe" what he was seeing when the vehicle flipped over.
He denied trying to cause serious injury.
Owen Maughan told jurors he thought he and Mr Mahon were going to fight after arguing back and forth between the cars, and he decided to dent the side of his car so he would stop and get out.
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The incident began when he and his father noticed a similar vehicle to theirs, and wondered if the driver may also be from the traveller community, he said.
But, after pulling up alongside, Mr Mahon was "aggressive and pointing at me", and Maughan said he got "pretty pissed off with it", so he started "following him just to try and annoy him".
After the crash, Owen and Patrick Maughan drove off, pausing while the older man removed the truck's registration plate, which Owen said was done in a "panic".
The pair will be sentenced at a later date.
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Ashley Warren, 41, was found guilty of owning an XL bully dog called Bear that mauled Esther Martin in Jaywick, Essex, on 3 February 2024.
The jury convicted Warren on the charge by a majority of 11 to one, but cleared him of being in charge of another XL bully called Beauty, which also injured Ms Martin.
The medical cause of her death was recorded as "dog bite wounds to the upper right limb".
A jury heard Ms Martin, who was 5ft 3in tall, had limited mobility following a hip replacement and had suffered "dozens and dozens" of injuries in the attack, including a bite through the tissue of her arm and a "complete fracturing" of the bone.
Warren, now of Addlestone, Surrey, had left her with the two XL bullies and eight puppies of the same breed, at his home in Hillman Avenue.
The amateur rapper had asked Ms Martin to mind the animals so he could travel to London to film a music video.
Warren had pleaded not guilty to being the owner of a dog - Bear - which caused injury resulting in death while dangerously out of control in a private place.
He also denied being a person in charge of a dog - Beauty - which caused injury resulting in death while dangerously out of control in a private place.
During the trial, at Chelmsford Crown Court, he said the XL bullies were "loving dogs" and were not "raised to attack or bite".
The case was the first of its kind since new laws on owning XL bullies came into effect at the start of 2024, Essex Police said at the time.
An inquest hearing was previously told Ms Martin was found unresponsive and had sustained "unsurvivable" dog bite wounds.
Police had visited the property about an unrelated matter 11 days before the attack, and a video recording played to jurors showed Warren telling the officer "it's a shame about the laws" and "my boy's got papers already".
Prosecutor Christopher Paxton KC said: "If that was a reference to an exemption certificate, that was a lie."
Warren accepted in court he did not hold exemption certificates and he had not applied for any.
He said in evidence he had "never seen this coming in a million years" and said: "I would never have left Esther with the dogs if I thought they were dangerous."
Warren was also found guilty of having a bladed article without good reason or lawful authority at Clacton railway station on 3 February 2024, after officers found a knife which he said was a prop in a music video he had been making that day in London.
By Monday, there had been 130 confirmed cases across the country this year, according to the UK Health Security Agency (UKHSA).
Of those, 34 were identified between 12 and 16 February.
Enfield has been the centre of the outbreak, with 50 confirmed cases coming from within the boundaries of the north London borough.
It has prompted one nearby council to warn that they expect the outbreak to spread to their area next.
And health bosses warn that the actual figure could be much higher due to a lag on lab testing.
Dr Vanessa Saliba, consultant epidemiologist at UKHSA, said: "The outbreak is still mostly affecting unvaccinated children under 10 in schools and nurseries.
"With the time lag involved with confirming cases through laboratory testing, we expect the actual number of cases to be higher.
"The outbreak has led to some children having to be hospitalised.
"Measles is a nasty illness for any child, but for some it can lead to serious long term complications, and, tragically, death, but is so easily preventable with two doses of the MMRV vaccine.
"All parents want what is best for their child. If they have missed any of their doses, or you're unsure, get in touch with your GP surgery. It's never too late to catch up.
"The MMRV vaccine will give them the vital protection they need against this highly contagious disease, but also help protect more vulnerable children around them who are too young or unable to have the vaccine due to a weakened immune system."
Measles is highly infectious among people who are not vaccinated, and can lead to serious complications such as pneumonia, brain inflammation and, in rare cases, long-term disability or death.
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Southend City Council said rising cases in Enfield mean that they are "likely to reach Essex, Southend and Thurrock", and urged parents to check if their children are protected.
The outbreak comes after the World Health Organization said that the UK is no longer considered to have eliminated measles.