Misc: who played the part of king arthur in camelot?

Questions

Which TV comedian wrote Katy and the Nurgla?

Which element has exactly the same name as a planet?

What nationality is the speedway rider Ole Olson?

Which county are you in if you are On Ilkley Moor bah't 'at?

Who are the only band to have made a debut appearance as bill toppers in front of 120000 people in Hyde Park?