You do know that we have a lot of cobbled streets here in Edinburgh? ;-)
On a serious note - I think the ongoing billion pound Great Tram Fiasco resulted in a lot of streets being left half-repaired for a long time as they were once part of the ever-shrinking tram route. Either that or the council is saving money on road repairs to help pay for it.
Or it might be part of the ongoing attempt to discourage driving in the city - which I don't mind as I pretty much walk everywhere!