Reduce the list. Postcodes starting with:

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Postcodes (90 items):
KA1131 (3)
KA1331 (1)
KA1531 (1)
KA1731 (1)
KA1931 (1)
KA2131 (1)
KA2331 (1)
KA2731 (1)
KA2931 (1)
KA3131 (1)
KA3331 (1)
KA3531 (1)
KB1133 (1)
KB1333 (1)
KB1533 (1)
KB1733 (1)
KB1933 (1)
KB2133 (1)
KB2333 (1)
KB2533 (1)
KB2733 (1)
KB2933 (1)
KB3133 (1)
KB3333 (1)
KB3533 (1)
KB3733 (1)
KB3933 (1)
KB4133 (1)
KB4333 (1)
KB4533 (1)
KC1135 (1)
KC1335 (1)
KC1535 (1)
KC1735 (1)
KC1935 (1)
KC2135 (1)
KC2335 (1)
KC2535 (1)
KC2735 (1)
KC2935 (1)
KC3135 (1)
KD1132 (1)
KD1332 (1)
KD1532 (1)
KE1137 (1)
KE1337 (1)
KE1537 (1)
KE1737 (1)
KE1937 (1)
KE2137 (1)
KE2337 (1)
KE2537 (1)
KE2737 (1)
KE2937 (1)
KE3137 (1)
KE3337 (1)
KE3537 (1)
KE3737 (1)
KE3937 (1)
KF1138 (1)
KF1338 (1)
KF1538 (1)
KF1738 (1)
KF1938 (1)
KF2138 (1)
KF2338 (1)
KF2538 (1)
KF2738 (1)
KF2938 (1)
KF3138 (1)
KF3338 (1)
KF3538 (1)
KF3738 (1)
KF3938 (1)
KF4138 (1)
KF4338 (1)
KF4538 (1)
KF4738 (1)
KG1139 (1)
KG1339 (1)
KG1539 (1)
KG1739 (1)
KG1939 (1)
KG2139 (1)
KG2339 (1)
KG2539 (1)
KG2739 (1)
KH1139 (1)
KH1339 (1)
KH1539 (1)