tv: Which ex Blue Peter presenter went on to present Songs of Praise?

Questions

one liners: how many californians to screw in a light bulb?one to do it and four to...??

one liners: knock knock/who's there/oj/oj who??

one liners: this bum told me he hadnt had a bite in days, so __ __ __??

one liners: when she sits around the house??

one liners: why did the chicken cross the road??