The duo want the UK to get naked and measure themselves as they hope to create the nation's most comprehensive body census.

In a brand new three part event for ITV1, the pair will tour the UK to investigae what lies beneath the UK's outfits they made their names styling for the new show.

They want to find out the nation's vital statistics by encouraging people to measure every aspect of their body, from height and waist, to chest size, leg and arm length and enter the data online at www.itv.com/body

They have recorded their very own 'how to' video - seen here - to encourage viewers to take part and demonstrate how to measure themselves, from the size of their feet to the length of their ears, every inch of the British body is covered.

"We think the British public suffer from a negative view about the nation's body shape - that we're overweight, unattractive, that we feel pressurised to look a certain way. So we want people to really look at themselves objectively, they'll then realise that it's not that way at all," says Susannah.

Trinny adds: "But to do this we need everyone to measure up! Dig those tape measures out of the kitchen drawer, get naked with your partner or on your own and measure everything - your chest, your legs, your arms, even, guys - your beer bellies!"

The Sage Centre, Gateshead will host Trinny and Susannah's road show on Saturday, April 12, and they want as many people to take part in the day as possible.

Their ultimate aim is to persuade people to ditch their clothes and bare their bodies in a massive naked sculpture depicting two inspirational people – a man and a woman that Trinny and Susannah will select during their tour for the grand finale of the series.

The road show events are open to all members of the public aged over 18 and do not require registration beforehand - anyone who wants to be part of the event can turn up on the day at the venues below.

To be part of the sculptures of the Great British bodies on Saturday 26th April please contact Gee Corbett on 0207 157 4721.

To take part in the online survey visit: www.itv.com/body