Just an update to this thread. BT Wholesale Checker is now reporting the following for my line.
For Telephone Number 01273683*** on Exchange KEMPTOWN
Your exchange is ADSL enabled, and our initial test on your line indicates that your line should be able to have an ADSL broadband service that provides a fixed line speed up to 2Mbps.
Our test also indicates that your line currently supports an estimated ADSL Max broadband line speed of 7.5Mbps; typically the line speed would range between 6.5Mbps and 8Mbps.
Our test also indicates that your line currently supports an estimated ADSL2+ broadband line speed of 18.5Mbps; typically the line speed would range between 17.5Mbps and 19.5Mbps. Our test also indicates that your line could support an estimated ADSL 2+ Annex-M broadband upstream line speed of 1.5Mbps and downstream line speed of 18.5Mbps; typically the downstream speed would range between 17.5Mbps and 19.5Mbps.
So maybe it was a junk estimate?

Interestingly enough also, is that availability checkers on the different ISP sites, Xilo etc.. are now offering me Be packages, whereas before they wouldn't.
Would anyone mind helping me in choosing an adsl2+ router? Nothing too expensive, upto and around £60 or so. I understand routers with the broadcom chipset is a very popular choice if your service is with Be/O2. I have been looking at the DG834,DG834G, DG834GT, DG834PN and the newer DGN2000 and DGND3300.
Many thanks again for everyone's help and suggestions!