Britain has secretly abandoned its blanket opposition to the death penalty and Guantanamo Bay to allow two notorious members of the "Beatles" group of Isil terrorists to be sent to America, The Telegraph can reveal.

Documents seen by this newspaper reveal that the UK Government has agreed to hand over intelligence to help prosecute the captured jihadists Alexanda Kotey and Shafee El-Sheikh, who both held British citizenship, in the US courts.

In a letter sent by Sajid Javid to Jeff Sessions, the US Attorney General, the Home Secretary says that Britain will demand no “assurances” that the pair will not be executed in America.

Other documents say that British officials have also assessed the pair may be sent to Guantanamo without trial and that such an outcome will not be formally opposed.

"I am of the view that there are strong reasons for not requiring a death penalty assurance in this specific case, so no such assurances will be sought," Mr Javid wrote, in the letter dated June 22nd 2018.