music: 70's Chart Toppers: Name The Artist: Days Gone Down?

Questions

Who, with William Gaunt and Stuart Damon, played the lead parts in television's The Champions?

Which Eurovision Song winning group's line-up was Mike Nolan, Bobby G, Jay Ashton and Cheryl Baker?

Which element, discovered by Pierre and Marie Curie, did she name after the country of her birth?

Collectively, what name is given to the first ten of the twenty six amendments to the United States' Constitution?

With which four words did Samuel Pepys end his diary each day?