If it's the same as last year with new celebrities who are too 'busy' to do a full series:

Graham Norton perhaps? Or Susan Boyle?

Tess!! On top of the Tree!!

JJ

Professor Brian Cox

Dan Snow

James May

David Tennant

David Morrisey

cant think of any women

any of the cast of Downton Abbey


I wouldnt even mind some "old" celebs coming back again, that'd be fun

Excellent list!