OK, it's more likely to be quick clay except that is taken by a
variety of clay that is thixotropic. Anyway...
When I lived in Abergele, the flood there in the 1990's caused a
similar amount of damage as is mirrored in a lot of England at the
moment. The insurance companies sent loss adjusters in as soon as
possible with the brief to settle claims as quickly as possible no
matter how high they were.
It turned out that the claims, however high were still less than the
real damage which the householders would have signed off
from .....with a different settlement.
The housing in the area was built on sand. I still is. And water
coming up out of the ground, which it did every high tide once the sea
wall broke, was causing the substrata to turn into quicksand.
On clay, the substrate will rise unless it is broken through. In which
case it will not rise evenly. In fact on any sedimentary substrate
there is every likelihood that there will be some sort of subsidence
with the aftermath of this flooding.
So if you are affected and have insurance, be careful what you sign.
You might care to let others think about it. I am not suggesting any
chain letters. I might even be wrong.
I doubt I am though, sadly. A hell of a lot of modern housing is built
on flood plains in the UK so the foundations are likely to be concrete
slab rafts on clay.