I have had limited experience with Sky Broadband but where problems have arisen they have been resilient in resolving the issue - although sometimes they have to be pressed.

I do not know if or when they plan to piggy back on BT's FTTP or FTTC services to offer upto 80 and upto 100mbps services for this area.

This link shows customer ratings for Sky and appears up to date.

http://www.kitz.co.uk/isp/ISP_rating.php

Perhaps the most worrying aspect for you may be that the "Reliability" rating appears to fluctuate wildly from bad to good.