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but because you're so well warmed-up
Gonna be honest, just walking from the parking lot to the beach already cooled me down enough that I had no interest in actually getting into the sea anymore... and I did not regret that decision when it started raining a bit later either.
But yeah, 'cold shock' is a good point as well.
SwissChap
Oliver Schick
Yes, the main reason generally given for deaths is that people don't understand how dangerous the currents are in the part of the Thames near Waterloo Bridge. No idea if that's the case at Kingston, too, as I haven't read that many reports about deaths there.
On Shadwell Basin, @kl is best-placed to comment. One problem is often that people feel very hot and jump into surprisingly cold water, which gives them a shock because the heat they feel is only superficial and they're not actually that warm inside. It's in marked contrast to when you've been cycling for hours and get in the sea at Dunwich even when it's freezing--it's an initial shock, but because you're so well warmed-up, it's blissful and quite safe if you don't stay in there for too long.
I'm sure there are other dangers of wild swimming, but I don't know them.