there's a number of traffic reducing measures in Clermiston; I'm guessing it must also be posher than where you used to live? Or was your comment about council inaction because of lack of poshness simply facetious?
There was "traffic calming" methods there, too - but there was nothing done about double parked cars both pushing road users to the wrong side of the road and blocking the view of on-coming traffic.
So, yes, it appears you don't have to be very posh to get speed bumps, but if you're in a posh area, the police/council seem to take more of an interest.