With so many Phone boxes in London it has been prudent to split the data down into manageable sizes, there are two variations of the data, either slicing London into four chunks centralised on Trafalgar Square (A B C & D), or by the relevant London Borough.

London split into sections A,B,C & D

Zone A: Public London ZA (Top Right)
Zone B: Public London ZB (Bottom Right)
Zone C: Public London ZC (Bottom Left)
Zone D: Public London ZD (Top Left)