Nay, sir!
I've had continuous problems since May this year, when I renewed my BT contract, and was "elevated" to their 80/20 service.
Perhaps 40 calls by me to them, perhaps 15 non-happening, of promised calls back to me, and numerous emails to BT left me where I was - when I made my last post - ie 4meg or 65, depending on which way the wind was blowing.
If you look in the BT threads, you'll see my complaints go back months.
Whilst I can see that it's not BT's obligation to fix my PC problems, it is their obligation to NOT feed me B/S for 6 months, telling me they're working on it/problem fine now sir/problem with your wiring - maybe need engineer visit/send me new HH3: all of this was to no avail, and the root problem should have been addressed by someone senior, with more knowledge than script-reading agents.
If the problem could be fixed with one sensible, in depth conversation with a BT guy who has the grasp of problems, then what's BT's excuse for not putting same or similar, qualified guy, on the case in May - if they were so sure that, given my IP profile was constantly @ 68Meg and this meant there were absolutely no line issues? I don't know if that quite constant IP profile actually translates to a perfect line - but that's what the last guy said.
Regarding AVG - all I can say is that when we disabled AVG the thoughput was consistently 65/68, when the previous day it had been 4Meg!
Time will tell.
Cheers, Les.

BTW speedtest just now 66.26DL 15.37UL
TBB speedtest just now 62.87DL 12.10UL

Well, I've installed the MS program, and am now keeping my fingers and legs crossed - hoping that it works OK!
cheers, Les.

Hope you uninstalled Mcafee the right way. If not it will continue to haunt you.......

http://service.mcafee.com/FAQDocument.aspx?id=TS101331

The document contains a link to download and run the removal tool.

Ha ha, I think you're right!
I did a conventional uninstallation, thought I 'd deleted registry entries as well but, when I did it via your suggestion, it appeared that there was still a lot of c**p left. It appears to have removed it all now - so I pray that the McAfee demons don't come and get me, for daring to remove them!.
Seriously, a couple of days now, with speeds being fine, seem to have addressed the problem - and I hope the MS av software is up to the job.. Other posters say yes - so here goes. Thanks for all the replies from everyone.
Cheers, Les.

Hi Andrew, Hope you're right. Being an MOT tester and not a computer whiz, I'm not aware of all possible complications regarding the actions going on in a PC.
I think I'm reasonably computer literate, but it never occurred to me to look at the AVG - why would it?
As I say, this BT guy - with a bit of detective work and probing - seems to have nailed it down: at least I hope so!
Cheers, Les.

http://schirmfoto.de/2939d9c490 is TBB tester just now - two days on.

http://schirmfoto.de/d77ab33867 is BT's recommended tester