Blue Peter, the BBC’s flagship children’s show loves to set their presenters a challenge. Having trained for a matter of weeks not years Radzi got the surprise of his life as we crested a ridge in the cable car to reveal the world’s biggest man made climbing wall.

In a sea of concrete we recced, rigged and climbed the Diga Di Luzzone and its 650 bolt on holds. Five pitches of 35m saw us over the handrail at the top of the hydro-electric dam. It was first order gut-wrenching exposure and overhanging for the top half. It was like climbing the inside of a gold-fish bowl.