Yes you may be flippant about it now but have you considered what a London flooding would mean?
Yes, thanks, I work in property and business interruption insurance in the city, so I’ve done quite a lot of reading and given it quite a bit of thought. Been a little involved in TFL’s insurance, so I know what storm surge over/round the Thames Barrier would mean for the underground (royally screwed, obviously)
We might not be coastal, but spring tides combined with southerly /souttheasterly winds in the north sea would have good slices of northern Europe: Germany, Belguim, Netherlands similarly screwed. Edit: as above: exacerbated by preceding heavy rains swelling rivers.
The one doomsday scenario that particularly grabbed my eye was the essex oil refinery storage tanks being split and lakes of fire being swept into Central London. Not entirely implausible.