Does the property have a valid Electrical Installation Condition Report (EICR)?

Surveyors are not qualified electricians or qualified to report on their condition in detail. 

Surveyors carry out a visual inspection of the electrical installation within the limitations of the terms and conditions of the agreed service. Due to the national Competent Persons Scheme and the fact that Building Control documents are not typically in the public domain more often that not your legal advisor will need to ask the vendor for documents to establish the condition of the installation.

In our experience the majority of vendors have not kept their electrical installations to current standards and correctly tested. Due to the change of ownership, we typically recommend a NICEIC (or similar) qualified electrician undertake an Electrical Installation Condition Report (EICR) of all circuits and report to the buyer prior to exchange of contracts.

Building Insurance policies can be invalidated if electrical installations are not correctly installed and inspected. 

Vendors and estate agents can help reduce delays to the conveyancing process by pre-empting this and obtaining a 'SATISFACTORY' EICR. The NIC EIC maintains a list of competent persons: https://niceic.com/find-a-tradesperson/

If work such as rewiring, a new consumer unit (fuseboard) or other work has been undertaken this should have been installed or checked by a competent person. A building control completion certificate should exist. This is different to the EICR and is required in addition. If an extractor fan or socket is installed there should be a Minor Works Certificate. 

There is also a very useful website https://www.electricalsafetyfirst.org.uk/