One aspect that Threads didn't go into detail about, was the whereabouts of Central Government during the nuclear attack.
From 1961 - ?, should a nuclear strike on the UK be considered imminent, they were going to head for their 35 acre underground bolt-hole at Corsham, North Wiltshire, known as the Central Government Wartime relocation headquarters - variously codenamed SUBTERFUGE, STOCKWELL, BURLINGTON, TURNSTILE.
Initially, it was to operate with 3,750 staff, but by the early 1970s this had dropped to circa 750.
Once the order to man the bunker was given, all 3,750 nominees would have evacuated London over a 14 hour period. Chartered trains would have collected them from Kensington Olympia Station and taken them to a still classified location, codenamed CHECKPOINT. From there, the MOD would have transported them in a huge single convoy to the enormous bunker underneath Corsham.
The original Interim Operational Manning Orders for the bunker (then codenamed STOCKWELL have recently been declassified, see below.
http://i49.photobucket.com/albums/f288/linstock/BURLINGTONT199924014.jpg
http://i49.photobucket.com/albums/f288/linstock/BURLINGTONT199924015.jpg
http://i49.photobucket.com/albums/f288/linstock/BURLINGTONT199924016.jpg
http://i49.photobucket.com/albums/f288/linstock/BURLINGTONT199924017.jpg
The BBC has recently set up a good site, devoted to the Cold War Central Government wartime HQ - BURLINGTON (see below)
http://www.bbc.co.uk/wiltshire/underground_city/index.shtml
And if you want to see how big this formerly Top Secret bunker really is, click on the link below. Its the official 1996 MOD map of the site, obtained through the Freedom of Information Act.
http://i61.photobucket.com/albums/h56/shadwellbright/54d685b0.jpg
Laclustre