Culshaw: 'Blair is more relaxed in new show'
The Dead Ringers star said he will continue to impersonate the former Prime Minister in new ITV1 series Headcases.
He is one of 26 voice-over artists taking part in the project from ex-Spitting Image head writer Henry Naylor.
He said: "Tony Blair I have always done, but he's very different in this show. It's as though the weight of the world has been taken off his shoulders, he's less harassed.
"He's got this sense of mischief and wants to stab Gordon Brown in the back. The 'deep responsibility' of government has gone."
Blair stirs up trouble for the new PM from his sunlounger in one scene from the show, which uses 3D computer-generated models to spoof celebrities including the Beckhams, Jordan, and Princes William and Harry.
The series also features Amy Winehouse and Pete Doherty as athletes competing in the 2012 London "drug Olympics".
Headcases starts on Sunday at 10pm on ITV1.