Last year my house was struck by lightening and a heavy surge in the electric current resulted in my loosing two computers; TV.; Electronic Keyboard and Beside Radio. Consequently, it was necessary for me to have my house wiring examined and up-dated as appropriate; bearing in mind that the cables were approx. 45 year old.......Result, the wiring proved to be in good condition and did not have to be replaced, but it was recommended that I have a new consumer unit fitted with Trip switches.; which was then installed. There was a question of my not having an earthed lighting circuit and quite correctly this was drawn to my attention and put in writing by the Electrician who agreed that I would be protected by the newly installed consumer unit's trip switches, although they should not be relied upon as the first line of defence and it was my decision not to proceed in a re-wiring job to install earthing.
You have not said how old the wiring is in your property. I have always been wary of offers for a free check from Electricity suppliers who might say that the house needs re-wiring when it doesn't; and even lead you to believe that your supply could be terminated if you fail to agree for a massive amount of work to be done. Best to call in a registered electrician whom you feel you can trust to be honest with you:as was the one I employed.
It might be worthwhile reading the replies I received from ABers about house re-wiring.
http://www.theanswerb...n/Question516077.html
Best wishes ....Ron.