Hmmm. Well I just tried the website speed upgrade and it tells me "
Error looking up cable modem details". From looking at this thread I take it that it is because I am not on the normal setup, but on the £20 a month, bought the modem originally offer.
So I phone up the support line indicated on the error page, and get through to Hindi ("tell me to slow down if I talk too fast sir"). I tell her the problem and she says (in a formulaic reading off the page kinda way) "Customer services will upgrade you in due time. Just wait for the upgrade".
Hmmmm. Does this mean they haven't upgraded my area (Bracknell/ Reading), or have I phoned one of the go by the rulebook lot?
If it's the second option, then does anyone know how to get through to that infamous friendly scottish lady directly? There would be a virtual pint in it for you... 
Cheers