Philip McCutchan and John Christopher were two other authors I read as a kid in UK. McCutchan wrote two WW3 books while Christopher is known for the Tripods about alien invasion as well as the usual natural disaster stuff.
JG Ballard was another SciFi writer looking at natural catastrophes.
Well known horror writer Dennis Wheatley also got in the act with a novel about a frozen London and a weird one about a Britain in an imagined 1930s where the monarchy is overthrown in Britain.
Neville Shute in addition to On the Beach wrote What Happened to the Corbetts just before WW2 about a family fleeing a bombed out Southampton after war starts.
Shute also wrote a curious book called In the Wet which has the Queen and her family leaving Britain and relying on.a loyal Australia for support.
Edmund Cooper prefered to take current trends and warp them into dystopian future Britains in Five to Twelve and Kronk.
Finally, HG Wells's original War of the Worlds is the seminal lay waste to London and the Home Counties novel. A graphic novel version called Scarlet Traces has taken the story up to the present day in a Britain warped beyond Wells's imagination.
These books were my reading between ten and thirteen. Much better than Harry Potter or The Hobbit. Shame the real thing in the form of Covid has been a nightmare but of the tedious sort.
