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Don't know specifically around Kingston Bridge, but I know that the stretch of river there can run very fast at times, although that's usually exacerbated by heavy rains.
I've rowed there before in an 8 where we were basically making no progress relative to the towpath even though we were going almost flat out
branwen
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.