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My suspicion is that for my general area, it is likely to be absolutely dictated by the available links from the FTTC to the PCP; and within that availability, by the staff available, priorities etc
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The local PCP is about 45 Metres away across the road; and to judge from the number of times I have seen it opened since VDSL went live back in April 2014, this is about once every three or four weeks, on a Thursday around mid-day generally.
This can be OR or Kelly.
The time spent at the PCP suggests that there is only one upgrade per opening generally.
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From when "my" FTTC went live (10 M from my front door), I have only seen it opened twice, the most recently about three weeks back, when the OR technician immediately checked the surface temperature of one of the batteries, using a remote infra-red "thermometer", with a laser beam guiding spot.
He then removed all of the terminal insulators on all of the batteries, measuring their voltages.
He apparently did not change any of them.
That he first checked a specific battery suggests that there is some form of remote monitoring.
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There are 96 actual double-links from the FTTC to the PCP, out of a socket back-plane of 288, catering for about 300 houses, with another much-newer estate totalling eventually 400 houses beyond (probably 200 presently), this has its own PCP and FTTC, if I have extracted the figures correctly. (Still more work to do.)
This suggests that there has not been a high demand for upgrading to VDSL.
Of course, it almost certainly varies across the country.
Prior to the FTTC etc, the PCP was very rarely opened, say once per year.
Since VDSL became available and the relatively frequent opening of the PCP and the implied potential physical interference with the wiring, I check my VDSL and also use QLT shortly afterwards, to ensure that there have not been any adverse effects.
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