Thanks again for your assistance.
I've been on suburb safari, and have physically located PLM/G, my new cabinet.
Interestingly it doesn't look that new itself, but does have what looks like extensive underground cabling work very recently done all around it, including the installation of a large "Telecom" manhole cover-type plate adjacent.
I've also noticed a number of recent short ADSL outages.
So I guess the fibre and local lines are in place, and the switchover work is in progress.
So, with all due impatience, I'll wait for a while to see what happens.
Thanks again for your help!