GENERAL KNOWLEDGE: Who seized the gold of Nibelungs before being killed himself?

Questions

Which famous radio family live in the county of Borsetshire?

Calciferol is more commonly known as which vitamin?

Which flower is also called a flag?

What was the name of the Austrian composer who became known as The Waltz King?

In which sport did Britains Jason Queally win an Olympic gold medal in Sydney 2000?