Misc: who owns all the swans in england?

Questions

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

Who came to the throne on the death of Edward IV?

The 1948 musical 'Where's Charley' was based on which English farce?

Which golfing term signifies as many holes in front of an opponent as there are holes left to play?

Which 1950 musical is based on the characters of Damon Runyon?