I think they are mainly in the South (but then I rarely venture north of the Watford gap)
We have one close to my work in Kingston upon Thames with a Starbucks and all, but even before I got into ebooks and was buying pbacks, I preferred Waterstones. This particular Borders was half the size (and it wasn't small) of the Waterstones, hideously laid out, had poor disabled access and was as untidy as heck. Its location is a bit more out of the way as well. Waterstones is right in the middle of the main indoor shopping centre so it gets most of the passing traffic, whereas you have to make an effort to go to the Borders.
The other one I recall is on Oxford Street in Central London.
There was a bit of bother fairly recently about the Borders in Swindon closing, so maybe (unfortunately) it is the beginning of the end?
What is sad if the Kingston Borders shuts is that it is right next door to another empty store which used to be Woolworths .....
