dingbat
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See that piece of string?
As always it depends. It depends on ease of access, the state of the property, the exact spec of the rewire, what geographical area you are in, whether or not power needs to be maintained during the job,etc...
It's impossible to give a figure without seeing it and discussing your particular requirements. As for doing some of the work yourself, you will have to work that out with whichever spark you eventually employ - unless all of your work is available for visual inspection you might not be able to find anybody willing to certify it.
You could do it all yourself, if you inform Building Control beforehand and pay for notification and inspections. Materials would come in at around £300-500 (depending, again). Employing a spark to do the lot could be anywhere from, say £1500 to £3000, depending on... well, the list above, really.
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