Can't be sure - but I read or heard a report it was Grove Park.
The BBC had this interesting photo from Reuters at the time.
Being an evil bastard with time on my hands I did pop up to do a recce and there were several street of same types doing the same thing.
Grove Park has some massive houses now converted into flats.
Does Brunswick Park have grand multiplexed houses? Does it have railings for putting cheeky posters on?
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A poster opposite Boris Johnson's London home shows not everyone supports his leadership bid