Britain looking 'more closely' at Israel's secret Iran intelligence

“Britain has looked more closely at this cache of documents than some,” said the source who also confirmed that the issue of Iran will “dominate” Wednesday’s meeting between Mrs May and her Israeli counterpart.

But they added they were “uncertain just how receptive” Theresa May would be to Mr Netanyahu’s argument that the cache of 100,000 documents seized by Mossad makes the UK’s current position – that Iran has not violated the 2015 accord – untenable.

Mossad officers, who have shared their intelligence with Britain, claim that the 2015 deal, which was hailed by Barack Obama as masterpiece of statecraft, “put Tehran on a track that will lead to nuclear capability.”

President Trump last month cited Iran’s refusal to come clean about the scope of its nuclear programme as a reason to re-impose US sanctions against Iran.

The UK, France and Germany issued a statement soon after President Trump’s declaration expressing their “regret and concern” and emphasising their “continuing commitment” to the deal.

This has prompted a fierce row between Europe and America, into which Mr Netanyahu will now seek to wade into.

France and Germany in particular are also known to have been counting on the lifting of sanctions against Iran to pursue lucrative commercial interests. They argue that modernisation of Iran will help to produce a modern moderate leadership in Tehran.