Strangely we are currently rewiring most of a 1960s house. The buyer was put off by the damning EICR and through the solicitor has somehow managed to knock a load off the final sale price.
To be fair, the wiring is ----ing awful, and was butchered by the builder who sold the house, some of the poorest domestic wiring I've seen in a while. No CPCs on most lighting circuits, yet 90% of switches and fittings are class I. In the switches that had CPCs the wire was connected to the earth terminal in the flushed in plastic surface pattress and not connected to the metal switch!
There is a consumer unit in an outbuilding, it is powered by 1.5mm SWA this is connected to the outgoing terminals of a 60A switch fuse. There is not enough sockets and the ones that are there are too low and hacked into the top of the skirting board as when they installed the metal back boxes they fitted them level with the top of the skirting so had to chisel out the top of the skirting to allow for the overhang of the sockets. They couldn't move the boxes as they were all fixed back with large amounts of gripfill. We have also found junction boxes hanging everywhere, a number of sockets spurred off of ring finals using 1.0mm and 1.5mm t+e, unterminated live cables plastered in walls, open circuit ring finals, wooden back boxes, loose terminals, outdoor joint boxes wrapped with duct tape.
Get a rewire done before you get unpacked. At least then you have all modern wiring system and you know there will be no hidden problems where you can't see them. You can have sockets and lighting installed in positions that you need. (don't forget TV and network points!) If you don't do it now it will likely need to be done some time in the near future, (remember much of the wiring is likely to be 60 years old!) and you don't want to be doing that after the place has been decorated and the house filled with furniture, a rewire is messy and disruptive work.
One of the nicest rewires we ever did was after a house sale, the owners had the moving company keep their stuff in storage and they then went on holiday for a week while we did all the messy work and the plasterer filled everything in.
We did turn a rewire down once, the owner had just fully decorated and had new fitted carpets, then expected us to magic the cables in the wall without damaging any of the new decorations or lifting the carpets...
That's my thoughts anyway.