Despite the protestations from Nick Clegg, Cameron has given the go ahead for a full blown consultation on Boris Island – the airport plan in the Thames Estuary. The Telegraph says Clegg has been fussing so much that the announcement was delayed from the beginning of the year. Clues that it was coming have been emerging since last summer when Steve Hilton and Osborne backed the idea. It’s Clegg that is being accused of playing politics in the Mayoral election year, but in even longer terms, if the £40bn plan gets the go ahead, it’s Boris who has the most to gain politically. Especially as has he won George Osborne over…