Yes, I'll probably take care around that area for a little while. I guess it's the kind of thing they'll have a bit of fun with for a while as long as they can get away with it, or until they find some other form of mischief.
I informed the police straight away, not much they can do about this specific incident, but at least they are aware that this sort of thing is going on.
I've lived in London for 7 1/2 years now, and this is only the 4th time I've been randomly attacked, and only one of those caused any injury (discounting several car-bike incidents, none of which have been serious, and which are a different category in my mind).