M4

Here’s a mammoth one that I’ve been putting off. London to Pembrokeshire … all 192 miles of it!

2 TW8 0BW
3 TW5 9RY
4 UB7 0JU
4A UB7 0DU
5 SL3 8UG
6 SL1 2SZ
7 SL1 5LX
8 SL6 2HY
9 SL6 2HY
9A SL6 2PJ
9B SL6 4LJ
10 RG40 5QS
11 RG2 8FT
12 RG7 4TX
13 RG20 8XY
14 RG17 0PU
15 SN4 0ET
16 SN4 8QP
17 SN14 6BF
18 BS37 6EJ
19 BS16 1SX
20 BS32 4JT
21 BS35 4AR
22 NP16 5UH
23 NP26 3DG
24 NP18 2TA
25 NP19 7JQ
26 NP20 5PN
27 NP20 3SE
28 NP10 8TF
29 NP10 8UF
29A CF3 5TZ
30 CF23 8RT
31 CF14 9FP
32 CF15 7NE
33 CF72 8SA
34 CF72 8ND
35 CF35 5NR
36 CF32 9SH
37 CF33 4EH
38 SA13 2PP
39 SA13 2AG
40 SA13 1EY
41 SA12 8HN
42 SA10 6NG
43 SA10 6LQ
44 SA7 9BS
45 SA6 6QN
46 SA5 7JH
47 SA4 9GR
48 SA4 0XH
49 SA4 0FU