A long shot, but one place which might be worth a look at is the Henry Barrass Stadium in Edmonton. Don't know how close it is to any housing, and it is basically a playing field today being used for non league football. However, it did once have a cinder running track and in the early 1960's Wally Mawdsley and Pete Lansdale unsuccessfully applied too run Provincial League speedway there. Looking on Google it appears that the owners are looking at ways to regenerate the site, and bring back its former glory.
If its possible, it would take a lot of money to introduce speedway there, but it could be hugely successful.