As already said the best person to get an idea of cost of remedial works is the person thats carried out the EICR , use that in negotiation with the owner of the property , You have made the right choice in having this done before buying , I think we have all seen the results of someone buying without having this done , if you are not sure about the cost of the remedial work and would like other quotes then do so if and when you have purchased the property , but use this initial quote to negotiate with , if its an older property then these are the sort of issues you mention that are quite common .....
If you are unsure of the interpretation of an y items mention then the quotation along with further information should clear this up.
Be prepared for the owner also to start getting quotes too though..
A borrowed neutral is dangerous as you could isolate the lighting circuit by the main fuse/mcb believing it to be safe/dead whereas it could still be live and you could be electrocuted. Clearly there are earthing problems however from what you say the remedial work should not really be that expensive. I work on testing rectification commercially and most earthing problems are loose connections/poor termination methods which are pretty simple to fix.
Impossible to say that it "should not be that expensive" from what has been written, but the I suppose that depends on whether you want to bring it up to standards or just ensure a Satisfactory result. The possibility that the lighting circuits are not earthed for example. Also, how close the bonding points are.
"Borrowed neutrals present a significant danger to anyone working on the circuits affected, it has never been permitted in the regulations as far as I know." Always puzzles me this one, to who exactly does it pose a danger? This situation with borrowed neutrals is viewed as though it is an isolated incident that should be treated as some kind of potential disaster that should be sorted out as a matter of urgency. It is not a C2. There are hundreds of thousands of houses that have borrowed neutrals on the hall/landing lights, that's how they were installed years ago, to save £££'s. To fix most of them would entail large scale work and probably significant re-decorating, which in a lot of instances is impractical. I have come across dozens of these situations in dwellings that have had them for donkey's years and they have never resulted in injury or death as far as I am aware, any "electrician" who is working on lighting circuits (of any description) should be aware that they are possibly the greatest source of danger in a domestic environment and act accordingly, and anyone else should not be working on them at all. Its another case or real world verses red specs world.
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