Central London:             SW1, SW3, SW5, SW6, SW7, SW10
                                    W1, W2, W8, W9, W11, W14, WC1, WC2
                                    NW1, NW8, N1
                                    EC1, EC2, EC3, EC4
                                    SE1
     
Outer London:               SW2, SW4, SW8, SW9, SW11, SW12, SW13, SW14,
                                    SW15, SW16, SW17, SW18, SW19, SW20
                                    W3, W4, W5, W6, W7, W9, W10, W12, W13
                                    NW2, NW3, NW4, NW5, NW6, NW7, NW9, NW10,
                                    NW11
                                    E1, E2, E3, E4, E5, E6, E7, E8, E9, E10, E11, E12, E13,
                                    E15
                                    N2, N3, N4, N5, N6, N7, N8, N9, N10, N11, N12, N13,
                                    N14, N15, N16, N17, N18, N19, N20, N21, N22                                           SE2, SE3, SE4, SE5, SE6, SE7, SE8, SE9, SE10, SE11, SE12,SE13,
                                    SE14, SE15, SE16, SE17, SE18, SE19, SE20, SE21, SE22, SE23,
                                    SE24, SE25, SE26, SE27, SE28

Canary Wharf:              E14, E16