Gentlemen.........
Thank you for your help. Since raising it here have taken it up with AOL/TalkTalk and speed has gone up to about 0.50 Mbps, done nothing at my end but thanks for the tip stigi. It at least keeps up with video.
Why not try a mifi or a wingle? You can get a wingle from Mr T's supermarket for 25 quid, unlocked, stick in a payg data sim to try it, if you like it you can get a rolling monthly contract data sim. No commitment.
Henry, your suggestion is way beyond my capabilities. I am not "techie"