Misc: On This Day In January 1839 - Composer John Knowles ______ was born.?

Questions

Where is a fish's caudal fin?

What is the name of the store founded by Barbara Hulanicki in the 60's?

Who came to the English throne on the death of Henry I?

What is a dogfish called when it is bought for food?

Which hospital once stood on the site of the Imperial War Museum?