useless trivia: What Word Means: Rhason?

Questions

Who wrote the words to Rule Britannia?

The name of which element derives from Greek word for violet coloured?

The title of which of Alan Bennetts plays is also the title of one of the Harrow School songs?

Pub signs - The Five Alls, the King is depicted along with which 4 other occupations?

Which employee of the Arthur Wilkinson pottery became well known for her Bizarre Ware?