tv: Comic and magician, catchphrase Just like that?

Questions

What ceased to be legal tender in the U.K. on 30th June 1980?

Which Italian artist, circa 1487-1576 gave his name to a hair colour?

Which plant has flower parts apparently resembling the instruments of Christ's crucifixion?

Which country, the most populous in Africa, was suspended from the Commonwealth in 1995 for anti-democratic behaviour?

Whose dying words were reputedly, "So little done, so much to do."?