I posted it up there, but plugging the figure into that site gives me:
ADSL2+ LLU: 20608 kbps
Line length: 1.4 km
Don't know if Sky's average is any use to go by, Tracy is on Sky and she gets about 16-17Mbps. Surely the average is based more on where the 'average' customer lives etc. than anything else?
Anyway, if they can't get it over 7.something Mbps I can cancel the account with no charge. Woop!