It's got a bit more confusing now that I've gone through my PCP to see which DPs FTTP has recently been enabled on - there's actually 10 FTTP-enabled DPs in all (apart from those serving the business park), which does equate to something the engineer deploying the fibre said at the time.
Unfortunately I didn't see enough of it going into the ground (only in my road, where there is only one enabled DP!), so I don't know if the other "zones" which have it have had one fibre CBT to cover several copper DPs, or actually do have multiple adjacent CBTs, which seems most likely.
The whole residential deployment is strange (as it overlays good FTTC), now even more so with its randomness.
Here's the map!