TimO said:
I think a lot of the time, local councils have byelaws that restrict this sort of thing, so it may be worth having a hunt around on their website, or talking to some one involved in parking there.
I was having a hunt around, and found this interesting comment on the Bromley council website:
So, possibly, should the council wish to get involved, they could force him to either move the vehicle or apply for planning permission (which I suspect he would be unlikely to get).
LOL Ha ha ha ha ha ha !!!! reality check, we live in a residential road close to a town centre, the LA have just introduced permit holders only parking with a full no parking restriction for anyone other than a resident.
When the line markers came around two cars were already parked in the road, the council hadn't got a plan in place to get them moved, so now we have two estate car sized gaps in the line, which are exploited on a daily basis. the restriction is also routinely ignored.

An email to the LA was responded to by the local Liberal dimwit councillor, who advised me that it was working in his street

(w@nker) and that I should call the police who would arrange for a warden to call and issue a ticket

ha ha ha ha ha ! get real you to$$er, we can't even get an officer round when our cars get broken into (twice) they aren't going to send a TW around to issue a FPN.
Bottom line nowadays- we live in do wot you likey Britain, cos aint no one gonna stop ya! Fecking sad state of affairs.

