PO Number	Town / Place name	Code
1	Abergavenny
2	Aberystwyth
3	Abingdon
4	Wantage
5	Accrington
6	Alfreton
7	Crick Longhope
8	Alnwick
9	Hoarwithy
10	Alresford
11	Alton
12	Altrincham
13	Ambleside
14	Amersham
15	Chesham
16	Missenden Gt. Missenden
17	Amesbury
18	Ampthill
19	Gilfach Goch
20	Silsoe
21	Andover
22	Andover Rd. Micheldever Station
23	Whitchurch Sennybridge
24	Overton
25	Appleby
26	Arrington Cray
27	Arundel
28	Ashbourne
29	Ashburton
30	Ashby DLZ
31	Ashford,Kent Ashford S.O.
32	Ashford U.L.
33	Atherstone
34	Attleborough
35	Axminster
36	Colyton Modley
37	Seaton Buckfastleigh
38	Aylesbury
39	Aylsham
40	Bagshot Newtown Tredegar Chapel Town, Mon.
41	Bakewell
42	Baslow Chiswick Login
43	Stoney Middleton Turnham Green Docking
44	Tideswell Resolven
45	Baldock
46	Banbury
47	Bangor
48	Barnards Castle Barnard Castle
49	Barnsley
50	Barnstable
51	Barton-On-Humber
52	Basingstoke
53	Bath
54	Battle
55	Bawtrey
56	Gringley Forest Row
57	Beaconsfield
58	Beaumauris
59	Beccles
60	Bedale
61	Bedford
62	Belford
63	Wooler
64	Belper
65	Berkhampstead
66	Berwick Berwick Station
67	Beverley
68	Bewdley
69	Bicester
70	Bideford
71	Biggleswade
72	Billericay
73	Bilston
74	Birkenhead
75	Birmingham Five Ways, Birmingham Gr. Hampton St. Birmingham Smethick, Birmingham
76	Campden
77	Halesowen
78	Henley-in-Arden Aldershot
79	Knowle
80	Bishop Auckland
81	Stanhope
82	Bishops Castle
83	Bishops Stortford
84	Canterbury
85	Bishops Waltham
86	Blackburn
87	Blandford
88	Bodmin
89	Wadebridge
90	Padstow
91	Bognor
92	Bolton
93	Borough Bridge
94	Boston
95	Alford
96	Stickney Aldershot Camp
97	Bury St. Edmonds
98	Dinas Mawddney
99	Caldicot