Thanks for the reply.
The BT exchange is ADSL (not fibre) as you say, so I cant understand why the
www.speedtest.net figures are so high and was wondering if there could be any other reason.
The Annbank exchange is showing as 'Under Evaluation' on the BT Openreach upgrade site and I doubt it would be upgraded anytime soon due to the lack of people who use it.
Cheers