Have renovated property two years ago - 5 bed in North London.
To rewire - £6.5k. This is for total rewire top to bottom including new ariel on roof, spotlights in kitchen and bathroom, new phone points, plug sockets etc, new fuse box. Used very reputable firm - NICEIC registered etc.
To re-plumb - absolutely everything new - new pipes, boiler etc - budge somewhere between £7-12K. We were able to use bits of existing central heating system. So paid around £5K.
To re-plaster (just skimming and making good as rewire causes lots of damage) - budget for £500 per room. Some rooms may only be £350. But that does not include stripping back and putting up new plaster board.
Other costs include - stripping out any old units, old wall paper etc. Flooring is quite crucial. It also doesn't include any problems you may not yet know about - damp-proofing, woodworm, structural issues, new windows or professional fees (structural engineers).
We lived in it, with two young children. We had loads of structural work done as well. Was a nightmare but not as bad as we thought - we got them to leave our bedroom till last and we all lived in one room for 2 months! Went to stay with other folks as much as we could.
Hope that helps.