BT Open Reach quote their roll out of FTTC (not Infinity - this is a BT retail product) normally in terms of "properties passed" or percentage of people / homes who can get the service.
This will be the number of people who are served by an enabled FTTC CAB.
This information is available to SKY, Talk Talk and probably all resellers of the BT Wholesale products - somebody would have shopped them by now if they were fiddling the figures.
The reason for the continual 3 month slippage is largely because BT allocated the same dates to more lines than they could realistically manage and are continually putting dates off by 3 months even when the know many of them won't hit that date. Whether they know which will and which won't is a moot point.
Ex <n>ildram , been to SKY MAX - 15,225 Download
BE Unlimited - 21,000 Download 1,200 Upload ON THE LINE THAT SKY COULD ONLY PROVIDE 15,255 DOWN AND 800 UP ON!!!,
Moved house, now BE Unlimited 6,500 Down, 1Mb/s up - gutted!
FTTC Cab installation commenced 12th April - expect full 80 / 20 - bye bye BE, hello BT Infinity soon!