Reduce the list. Postcodes starting with:

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Postcodes (149 items):
W1 (14)
W10 (6)
W11 (4)
W12 (6)
W13 (4)
W14 (5)
W1A (1)
W1B (1)
W1C (1)
W1D (1)
W1F (1)
W1G (1)
W1H (1)
W1J (1)
W1K (1)
W1M (1)
W1S (1)
W1T (1)
W1U (1)
W1W (1)
W2 (11)
W3 (6)
W4 (9)
W5 (9)
W6 (6)
W7 (3)
W8 (4)
W9 (5)
WA1 (3)
WA10 (3)
WA11 (4)
WA12 (2)
WA13 (5)
WA14 (5)
WA15 (4)
WA16 (16)
WA2 (3)
WA3 (11)
WA4 (16)
WA5 (4)
WA55 (2)
WA6 (12)
WA7 (8)
WA8 (7)
WA88 (1)
WA9 (3)
WC1 (7)
WC1A (1)
WC1B (1)
WC1E (1)
WC1H (1)
WC1N (1)
WC1R (1)
WC1V (1)
WC1X (1)
WC2 (11)
WC2A (1)
WC2B (1)
WC2E (1)
WC2H (1)
WC2N (1)
WC2R (1)
WD1 (4)
WD17 (1)
WD18 (1)
WD19 (1)
WD2 (5)
WD23 (1)
WD24 (1)
WD25 (1)
WD3 (10)
WD4 (4)
WD5 (1)
WD6 (3)
WD7 (3)
WD99 (1)
WF1 (3)
WF10 (6)
WF11 (6)
WF12 (3)
WF13 (1)
WF14 (2)
WF15 (2)
WF16 (1)
WF17 (2)
WF2 (5)
WF3 (6)
WF4 (15)
WF5 (1)
WF6 (2)
WF7 (5)
WF8 (8)
WF9 (8)
WF90 (1)
WN1 (2)
WN2 (7)
WN3 (1)
WN4 (3)
WN5 (3)
WN6 (5)
WN7 (3)
WN8 (8)
WR1 (1)
WR10 (22)
WR11 (26)
WR12 (9)
WR13 (19)
WR14 (8)
WR15 (17)
WR2 (14)
WR3 (4)
WR4 (1)
WR5 (7)
WR6 (44)
WR7 (15)
WR8 (18)
WR9 (21)
WR99 (2)
WS1 (2)
WS10 (4)
WS11 (5)
WS12 (7)
WS13 (9)
WS14 (8)
WS15 (16)
WS2 (1)
WS3 (3)
WS4 (2)
WS5 (1)
WS6 (3)
WS7 (6)
WS8 (3)
WS9 (5)
WV1 (2)
WV10 (7)
WV11 (3)
WV12 (1)
WV13 (1)
WV14 (3)
WV15 (13)
WV16 (35)
WV2 (1)
WV3 (1)
WV4 (3)
WV5 (8)
WV6 (11)
WV7 (4)
WV8 (5)
WV9 (2)