My husband is an electrician. The other thing that you have to think about when comparing quotes is how in depth the rewire actually is. You could think you're making a comparison but a house that is having a very basic rewire will obviously be much cheaper than one where the customer wants lots of sockets in a room, top quality switches and sockets or even chrome. TV points, data cabling, these things all make a difference. There's also a big difference if you just one want one white plastic pendant in your rooms as opposed to down lights etc. We live in an area where most houses have thick stone walls, takes much longer to do the job. Another major factor is that it is much easier and quicker to rewire an empty house. My husband sometimes has to spend a lot of time moving furniture and it's amazing the number of clients who don't even make an attempt to put their things away or prepare their house slightly. I'm sure there are points that I've missed but there are factors which can make a big difference on price.
We've been quoted £6.5k for a small 4 bed house. I think it is expensive but we are in Surrey and I feel that we have to pay through the nose for any work that we need to get done. Thie quite doesn't include patching up the wire chases.
We are currently having our house rewired (incl down lighters in most rooms, new fuse board, new sockets and switches etc). its a 4 bed house we were quoted from £4300 to £4700, not incl making good the chases. Very messy noisy work - good luck!