The Count might have heard of a Scotsdowne racecourse but I haven't - and neither has Google!
Indeed an advanced search on Google for 'Scotsdowne' (eliminating all references to 'Scotsdowne Road' and 'Scotsdown') effectively draws a blank. It doesn't appear, for example, as someone's surname or as the name of a stately home. There are simply no meaningful references.
In Ipswich (where I was raised) the councillors have named estate roads after racecourses, poets and lots of other themes (with no apparent reason other than 'it seemed a good idea at the time'). In other towns there are sometimes more meaningful connections to local history. (Where I live now has a series of roads named after former head teachers of the local primary school).
In Trumpington, the councillors appear to have possibly named a group of roads after cathedral towns. (Ely, Salisbury, Beverley and Exeter). However the local history society accepts that 'Beverley' might have simply been the surname of a prominent local resident:
http://www.trumpingto..._connection_Hall.html
However there appear to be few clear pattern in Trumpington's street naming:
http://www.trumpingto...roup.org/streets.html
Chris