Good call Britspark,
The thing that you have to think about with any old installation is often the lack of Earthing on Light fittings and the like.
Safety is paramount these days and the best way to ensure this is a good, low resistance connection back to the supplying Switchboard.
Cable integrity is another factor, with older cables, with any movement can cause them to crumble leaving bare wires.
I don't subscribe to the idea of sleeving bare wires with PVC sleeving.
I'd sooner tear the whole lot out and start again.
Old wiring systems are nothing short of a fire hazard and in some cases can indemnify your Insurance policy.
However Britspark, I think you did the right thing in sending the letter to the son, something may get done about it, although I wouldn't hold my breath.
Guys, if you are going to write a letter like this, back it up with test results and an explanation of the results.
It's your best defence and also a marketing tool, you guys are professionals, use that to get work. [Linked Image]