It's great where Mudcat threads lead. Rick's 'Samuel Pepys...' thread induced me to find an on-line version, I'd heard about. There's plenty of info on London Pubs of the 1660s

In the medieval Palace of Westminster there were three rooms called 'Heaven', 'Hell' and 'Purgatory'. These were dining rooms [and alehouses] named after wall hangings or frescoes that were on the walls at one time.

"Nor break his fast
In Heaven and Hell."

Ben Jonson's Alchemist, act v. SC. 2.

Quite appropriate for the Houses of Parliament, methinks...

Cheers - Sam