@IWRATS: I'd have to say that my experiences on Cluny Gardens in recent weeks/months haven't been particularly bad as regards speeding. If anything I get the impression that the locals at least are already treating it as a 20 limit (which actually means that they do a bit less than 30, like in all the other 20 limits). I've certainly not seen any examples of outrageous speeding, but I do recognise that it only takes one such encounter to make one very sensitive to the behaviour of all drivers.
There are some drivers who, for one reason or another (although having access to sackloads of cash obvious helps) simply DGAF. One young lad completely totalled his Merc in the process of demolishing a friend's front wall on Grange Road a while back. He called round to visit her a few days later, to apologise and to make sure that his insurance company was playing ball. He arrived driving a brand new, higher spec Merc (which he confirmed was the replacement for his wrecked one).
Actually, on Cluny Gardens/Charterhall Road I more often get worried about drivers' simple carelessness and lack of attention/observation (ref my comments elsewhere about such around the parking area by Blackford Pond).