I've just been thinking about this thread..
If the installation is from the early 60's then it might be VIR (rubber) wiring or it may be imperial PVC that's suffering from "green goo" (plasticiser migration).
You'll be best off getting a second or third opinion anyway so that you can compare their prices.
Also if I had a house that I was renting out then I'd make sure that everything (not only the electrics) was spot on, then you'll get fewer callouts to the property for problems and you also have a good base line for any future arguments about the condition of the property.
Do it right and do it once, bodge it and you'll be forever bodging it together.
If the installation is from the early 60's then it might be VIR (rubber) wiring or it may be imperial PVC that's suffering from "green goo" (plasticiser migration).
You'll be best off getting a second or third opinion anyway so that you can compare their prices.
Also if I had a house that I was renting out then I'd make sure that everything (not only the electrics) was spot on, then you'll get fewer callouts to the property for problems and you also have a good base line for any future arguments about the condition of the property.
Do it right and do it once, bodge it and you'll be forever bodging it together.