Reduce the list. Postcodes starting with:

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Postcodes (71 items):
RG1 (1)
RG10 (13)
RG12 (3)
RG14 (6)
RG17 (17)
RG18 (9)
RG19 (4)
RG2 (5)
RG20 (45)
RG21 (1)
RG22 (1)
RG23 (3)
RG24 (4)
RG25 (23)
RG26 (16)
RG27 (24)
RG28 (6)
RG29 (6)
RG30 (1)
RG31 (3)
RG4 (11)
RG40 (3)
RG41 (4)
RG42 (7)
RG45 (1)
RG5 (1)
RG6 (1)
RG7 (36)
RG8 (18)
RG9 (35)
RH1 (8)
RH10 (9)
RH11 (6)
RH12 (13)
RH13 (23)
RH14 (16)
RH15 (1)
RH16 (3)
RH17 (21)
RH18 (4)
RH19 (11)
RH2 (5)
RH20 (28)
RH3 (3)
RH4 (2)
RH5 (20)
RH6 (9)
RH7 (5)
RH77 (1)
RH8 (6)
RH9 (2)
RM1 (1)
RM10 (1)
RM11 (1)
RM12 (3)
RM13 (3)
RM14 (4)
RM15 (2)
RM16 (4)
RM17 (2)
RM18 (3)
RM19 (1)
RM2 (1)
RM20 (1)
RM3 (2)
RM4 (9)
RM5 (1)
RM6 (1)
RM7 (1)
RM8 (2)
RM9 (1)