It was probably banned because for some reason they decided to include a shot of a woman peeing herself in fear! It is quite an effective video, certainly a lot of money must have gone into it 'cause it's better quality than anything that would be done now. They'd use crappy CG for most of it. The figure they use, 210 megatons hitting the UK, I'm not sure an attack of that magnitude would or could actually happen now in the event of nuclear war. That really is worse case scenario (unless everyone in the world launched at us! You never know, it could happen if we piss off the Americans too much...that's why we have to keep them sweet by going to war with them...)