epa05887827 A handout photo made available by the Saudi Press Agency (SPA) shows Saudi Crown Prince Muhammad bin Nayef (R) welcoming British Prime Minster Theresa May (L) in Riyadh, Saudi Arabia, 04 April 2017. May is visiting Saudi Arabia as part of her Middle East trip to boost diplomatic ties in the region following Brexit. EPA/SAUDI PRESS AGENCY HANDOUT HANDOUT EDITORIAL USE ONLY/NO SALES

An investigation into the foreign funding of extremist Islamist groups may never be published, the Home Office has admitted.
The inquiry commissioned by David Cameron, was launched as part of a deal with the Liberal Democrats in December 2015, in exchange for the party supporting the extension of British airstrikes against Isis into Syria.
But although it was due to be published in the spring of 2016, it has not been completed and may never be made public due to its “sensitive” contents.
It is thought to focus on Saudi Arabia, which the UK recently approved £3.5bn worth of arms export licences to.
A spokesperson from the Home Office told The Independent a decision on the publication of the report would be taken “after the election by the next government”.
But in a separate interview with The Guardian, a spokesperson said the report may never be published, describing its contents were “very sensitive”.
Tom Brake, the Liberal Democrat foreign affairs spokesman, has written a letter to the Prime Minister pressing her on when the …