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Ta (and @Colonel_of_Truth )
I think the new tall residential towers nearby might have peregrine boxes/platforms so while I'm pretty sure it wasn't one there's a chance yet. They also installed a couple artificial otter holts. But however hard I try I can't imagine otters in the lower Lea...
Kestrels are small, as are male sparrowhawks. You almost certainly saw a female sparrowhawk. Peregrines consider pigeons to be an easy lunch, to give an idea of comparative size. Peregrines are slightly less common than an available black cab in a thunderstorm in London.