So we have been attacked and a couple of nuclear weapons have wiped out the UK
Your mathematics and understanding of the effects of Nuclear weapons are woefully inadequate to the point of childishness.
A couple of nuclear weapons exploding, even in large cities would be devestating, terrible, horrific – but they most certianly would not result in “all UK people are dead/dying”
Huge amounts of work was done on this in the Cold War – exercises like Hard Rock and Square Leg, which was predicated on a 200 MT, 130 odd warhead exchange hitting the UK, and even that got nowhere near your “all UK people are dead/dying”
Maybe go away and learn something about it before spouting the type of alarmist, naive crap that you get from Momentum websites.