Dave's potty picking Oli.

Byline: Kevin Maguire

DAVID Cameron has turned in his hour of need to another tailcoat in his brigade of Old Etonians.

Merchant banker-cum-policy wonk Oliver Letwin is the Tory toff's new best friend.

Multimillionaire Oli is charged with filling the hole that is George Osborne by conjuring up savings in public spending. He's the Oliver Letwin thanked by Gordon Brown for helping Labour win the 2001 election when he proposed pounds 20bn of cuts.

I remember Labour dressing up a bloke as Sherlock Holmes and hiring a hound to sniff him out when Letwin ran away to Dorset.

At the 2005 election, Oli wanted pounds 35bn cuts and performed the same trick for victorious Labour.

The recession-hit battleground may shift in 2009 or 2010 yet this blast from the past nails the lie that Cameron's modernised the Tories.

Snobby Letwin infamously declared he'd rather beg on the streets than send his kids to a local state school.

He's also the bright spark who let two strangers into his house at 5am to use the toilet then gave chase in his dressing gown when they nicked credit cards.

This is Cameron's big hope/dope who claimed it was someone else who stuffed wacky-backy in his pipe at uni. A student with a pipe? How potty's Letwin?