Misc: What kind of "yarn" was Murder at Moorstones Manor?

Questions

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?

what is the name of the large diamond acquired by the british on the annexation of Punjab in 1849, and placed in the crown jewels of Queen Victoria?