Best thing you can do is as soon as the paper works in contact the DNO yourself & get appts booked to upgrade the fuse to 100A & fit an isolator this doesn’t cost anything. Otherwise BP will send their contractor out & they’ll call it off or mess you about.
As soon as the paperwork has been sent to the DNO you can call them & get stuff booked in. Mind had to do fuse, holder, isolator & new main incomer as all old stuff was only rated to 83A if I’d waited on BP organising that I’d still be waiting I suspect. Just call up the DNO & explain you’re having a charge point installed & they’ll sort it free of charge (most do)