John Letts and Sally Lane have been protesting and fasting outside St Paul’s Cathedral in central London since last week. They say it is a demonstration against parliament’s failure to help bring their son home.

The authorities suspect he’s been fighting for IS, a claim which his parents refute.

“Since he has been out of ISIS territory, he has said ‘Well, now I can explain.’ Him and a group of friends were working against ISIS from the inside,” Lane told RT.  

“And in fact I’ve spoken to some of his friends and they are still in hiding. They say things were made very, very difficult for them when Jack was labelled a terrorist by the British government because it then compromised their position.”

He later phoned his parents, saying he’d fallen foul of IS and asking them to send money to help him escape the terrorist group’s territory. He succeeded in getting out, and the last his parents heard he had been captured by YPG - the anti-IS Kurdish militia, and is in one of their prisons.

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They have not had contact with him for three months.

Lane says the government must address the issue that it is “immoral and illegal” to “leave somebody in a hole with no trial, no process, no charge, what he did, why he did - they are questions he can answer.”

“At the moment he’s been locked in a room. They’ve thrown away the key, and he’s just been left to rot.”

The Foreign Office told RT it has been in touch with the Letts family and underlined the complexity of the situation.

“As all UK consular services are suspended in Syria, it is extremely difficult to confirm the whereabouts and status of British nationals there. Anyone who does travel to Syria, for whatever reason, is putting themselves in considerable danger,” a spokesperson said.

They added that anyone who returns from the conflict in Syria and Iraq must expect to be investigated by police.

Letts and Lane are awaiting trial for funding terrorism by sending cash to their son - charges which they deny.