I'd love another programme, focussing on the researchers, telling us HOW they found out the information. Some celebrities are totally surprised by what's found, so they can't have given much guidance at the beginning.
I mean, on the programme we always seem to see the celebrity walking into archives or records offices to be met immediately by a helpful member of staff with the precise book open at exactly the right page! Now WE all know it doesn't work like that. So how do you go about finding ancestors who come from overseas - for example loads of us must have Irish ancestors, (but will never be able to get to Ireland) or German or French or whatever? Or what about pre 1830s ancestors who don't appear on the IGI? Maybe such a programme would have limited interest, but I'd be willing to sit up late to see it.
I'd even like to see what defeated the researchers - were there celebrities they 'rejected' because their trees were too difficult to trace?
But the Natasha Kaplinsky programme must be counted as a success, judging by the debate it's generated here. So well done the research team!