Anti-terrorism powers were used on Wednesday to recoup money owed to UK depositors in a failed Icelandic bank in a move that risked sending Britain’s relations with Reykjavik to their lowest since the 1970s “cod wars”.

UK taxpayers are likely to pay out at least £2.4bn as part of a £4.6bn scheme to compensate hundreds of thousands of account holders at Landsbanki, the Icelandic lender, according to Whitehall sources.