A small bit of good news in that they have said they “can” fit a new consumer unit but I would be responsible for the “correction of any wiring”. Not sure what that means so I’ve asked for further information.
I take that, as, if there was a fault somewhere on the existing house wiring, that hasn’t manifested, due to no or very little protection provided by youre existing fuse box, “could” show itself/manifest, due to the added protection from RCD’s, RCBO’s and MCB’s pressant on a modern consumer unit. However, any sensible electrician would do an in depth insulation resistance test, to check that existing wiring is good order with no faults prior to replacing your existing fuse box.
Failure to carry out any pre insulation checks could potentially open a can of worms and prove costly!
FWIW I have always charged a fee to carry out a pre insulation resistance check prior to changing an old board and the results are given to the customer. If the customer agrees, to go ahead with the work, the pre check tests are discounted from the invoice.
In the majority of cases, there is no fault on PVC sheafed cables or a fault that is easy to find and recify, however, you do get times, where a partial or full rewire is required, hence the importance of carrying out pre checks with your test equipment. If you find a premises with the old rubber cable, it would be a rewire before fitting the new consumer unit.
By ensuring, the test equiment is used to carry out checks, prior to a new consumer unit being fitted, you have a comeback on the electrician, if a fault/s is found they haven’t told you about and you have full control whether or not to carry on with the work, if you are told about a fault/s and extra costs associated with it, to put it right.
I hope the company hasn’t run out of money and awaiting income to buy the battery!
Keep nagging!