My London list, ongoing and copied from my iPhone notes.
St. John’s Wood Church Gardens- top left hand side, free
Soutbank- royal festival hall
Southwark, Bermondsey- white cube. Art gallery, untested.
Parliament square- untested
Camberwell Green - free, on corner
Burgess park - in sports centre or near lake, behind cobourg primary school, free
Borough - shell station
Embankment - 50p
Baker Street - untested
Spitalfields - free, awkward
Vitoria Station- sort of outside station
Regency Street- 50p