Just tried this with UK Power Networks they pointed me at the eV installer paperwork, in short they dobt/won’t do anything until you have an install actually lined up & your installer “applies to connect”
So no time saved or shortcuts there. Jordan from Artisan is always a good watch covers the subject well here saw that video a little while back when it popped up on my feed.
UKPN did confirm any work they do will be FOC (ie change the main cut out fuse) altho some will need a sparky to replace the meter tails if the fuse is changed from say 60A to 100A which the householder will have to pay fir & will need doing before the fuse is changed.