Mutley:
.... now needs to let the property out and so she has had an EICR done which has come back with saying it needs a total rewire for few grand.
Looks like you have been codebreakered. It may be more cost effective to have another EICR.
It takes far less knowledge and experience to Report and arbitrarily condemn everything, than to accurately Report on the condition of an installation. The former will be cheap, short term gain long term pain, the latter, a fair cost to do it properly and honestly and if remedial action required, the most likely method is not a whole new install.
We're about to take you to the IET registration website. Don't worry though, you'll be sent straight back to the community after completing the registration.
Continue to the IET registration site