The electrician who installed my Hypervolt opened mine up and checked - they seemed comfortable doing it and then reported an issue to the DNO relating to the earth, so didn't appear to hide their actions. But they said the same, the label on the outside doesn't mean anything really
I have a 60 Amp main disconnect DNO fuse fitted to my property.
We also have a 100 amp double pole switch isolator switch fitted, in-line with the meter tails.
When my energy company came to install a new SMES 2 Smart meter, it was interesting to see the guy, first he isolated the power with the 100 Amp isolation switch ( rendering everything above the switch as dead ) but then went about pulling the main fuse disconnect ?.
Safety first I guess ?.
He then spit the case of the main fuse to check what was installed.
It was marked as 60 amp's and it was indeed a 60 Amp inside.
When I asked him he was going to upgrade the rating, he said only the DNO can carry out that upgrade.
Fair enough, so we are still running on the original 60 Amp fuse.
Although the fuse is rated at 60 Amp I do feel that the actual "Fail" rating of the fuse is a little higher than the 60 Amps stated to be honest.
I have been charging regularly from my wall box for the last 6 years plus now without any issues.
I charge overnight on the cheaper "Off - Peak" rate to limited the demand on the system.
My cheaper rate is also all weekend, so is I do need to charge in the day light hours, you just have to be mindful of what other items that are running at the same time as charging.
It's just common sense really.