Another day, another door

This rather elaborate doorway is one of the side entrances to Leamington Town Hall which stands on the main shopping street, The Parade. It is very different from the door I posted on the 5th February - not least because I would not have wanted to see what was happening behind these doors when they were still in use. Can you guess what this was the entrance to? There is a clue in the picture (best viewed large) - see if you can work it out...