A HD cab is a dslam cabinet that has been expanded with higher port capacity cards and additional ties pairs. In this case 128-256 ports. In this instance the pcp also requires reselling to provided additional tie pair capacity

Very clear, thank you.

This means they're expecting to exceed 41% penetration of FTTC (=128/310).

It won't be long before the original capacity runs out. It may have been at capacity previously.

In reply to a post by candlerb:

This means they're expecting to exceed 41% penetration of FTTC (=128/310).

As stated in the latest BT Group results (See TBB News Item) BT has now increased their take-up assumption from 41% to 61% of total premises passed

Update: shiny new PCP cabinet is now in place - wider than the old one, but no G.Fast pod.

I found that in the availability checker, when I search for my phone number, the WBC FTTC Availability Date shows as "Available" - but if I search by address it says "Waiting List". So it does indeed look like an out-of-capacity situation had been reached.

Being a BDUK funded cab, I wouldn't expect g.fast anytime soon if ever

OK, thanks. Doesn't affect me anyway - firstly I'm too far away, and secondly I have FTTPoD install in progress

Not true, has happened and will happen a lot more. Openreach are allowed to use BDUK funded FTTC to deliver G.Fast.