I thought I'd also post my map of cabinets which currently covers Westgate, Margate, Broadstairs and Ramsgate in Kent.
All cabinet locations are to my knowledge in the correct positions, and as far as I'm aware covers all cabinets on those exchanges.
Link to map, if you wish to view it in a larger map then there is a Google link below the map picture, which also lists all the cabinets. Clicking a marker will pop up information about that cabinet.
Since creating the map in March 2012 it's had almost 14,000 views