A mate and I are making the pilgrimage to the Slaughtered Lamb Black Swan soon for a Campari & Soda!
As this involves a trip in and out of London we have come up with a small list of other pubs we'd like to visit:

The Blind Beggar & The Carpenters Arms of Krays fame.
Cart & Horses - birthplace of Iron Maiden.
The Grapes - Ian McKellen's pub

This is going to need a lot of moving around and we haven't decided on a running order yet so any advice welcome.

Also any other interesting pubs we could take in and any must do's near these pubs would be welcome!