Roberts wrote:

I was contacted by phone and told that my fuse box was over 40 years old and
needed to be replaced. The company Electrical Safety Group gave the
impresion that they were linked to a energy supplier. They came to the house
and checked the wiring and left a a list of things to be done costing about
£800 on reading their inspection report

Scammers.

No doubt their report highlights every possible item for bringing the
installation to current standards ... unless you want this doing (or are
having other electrical work done) there is no requirement to do this.