ONCE they were sworn enemies. Now Israel’s Mossad intelligence agency is working with Saudi officials on contingency plans for a possible attack on Iran if its nuclear programme is not significantly curbed in a deal that could be signed in Geneva this week.

Both the Israeli and Saudi governments are convinced that the international talks to place limits on Tehran’s military nuclear development amount to appeasement and will do little to slow its development of a nuclear warhead.

As part of the growing co-operation, Riyadh is understood already to have given the go-ahead for Israeli planes to use its airspace in the event of an attack on Iran.

Both sides are now prepared to go much further. The Sunni kingdom is as alarmed as Israel