I found a document where Openreach were applying for the right to use unmetered supplies for FTTC cabinets.
Part of the evidence they used gives the state of the FTTC rollout at March 2013, including the numbers of every type of cabinet, and the number of cards in each. It seems that these 24,000 cabinets had been used to sample power usage in the last 6 months of 2012.
Huawei MA5616T: 3,600 cabinets, of which 2,700 had 2 linecards, and 500 had 3 linecards (32 ports per card). 91 cabinets were fully populated with 4 cards.
Huawei MA5603T: 13,000 cabinets, of which 4,000 had 1 linecard, 8,000 had 2 linecards, and 700 had 3 linecards (48 ports per card). 13 cabinets were fully populated with 6 cards.
ECI M41: 7,700 cabinets, of which 5,500 had 1 line card, and 2,100 had 2 line cards (64 ports per card). 13 cabinets were fully populated with 4 cards.
So, out of some 24,000 cabinets, there were around 120 (0.5%) which had a full complement of line cards, and (presumably) a slightly lower number that had a full set of active lines.
Each cabinet apparently triggers the process for an additional card when utilisation reaches 75%.
A further document went alongside this application, giving some more figures.
This said that the rollout, at April 2013, had grown to 33,000 cabinets. It also indicated that BT could deploy a further 80,000 cabinets by 2015, and a further 20,000 by 2020.
That would be a total of 133,000 FTTC cabinets.
Aren't there supposed to be around 88,000 PCP's in the access network?