It looks about the same size and shape as (I can't think of anything else to use as a description!) a seat on a swing! :o) But it's very flat, almost as if there is nothing in it.
The programme is on at 7.30pm Mon-Fri on Discovery (Sky+ channel number 520).
I thought he had more hair too so searched the internet. Turns out he did a show for BBC2 in 2000 called Don't Look Down. Looks like its just been renamed by sky and billed as new!