Looks like this has just been attached with cable ties, which may not be very secure in windy weather. You can report it here: http://www.haringey.gov.uk/planning-and-building-control/building-c...
Probably not, but then what do they care? it will probably be there for years and years anyway, just like the rest of them.
As I have said before, if I had the money I would hire a cherry picker and take down all the boards along green lanes that have been allowed to remain untouched because they are a sodding eyesore.
He wasn't killed by an estate agent's sign, it was the shop sign that wasn't properly secured. As in the one that hung across the front of the shop, which was double fronted. Quite a bit bigger than an estate agent's sign.