We've recently sold an old house.
When we purchased the house 25 years ago it had a FUSE BOX in the kitchen, near ceiling height.
Subsequently rewired into a DB (with Earth leakage etc), but still 2.3m above floor level.

Electrician issued a CoC after all relevant tests, BUT the new owner is challenging the legality of the DB, due to "health & safety reasons".
New owner insists that the DB should be re-located down to a "safe height".

Any firm regulations in this regard?