My Local Council will not accept an EICR for a property they intend leasing, if it is issued by someone not registered with a Competent Persons Scheme. The fact that inspection and testing does not fall under Part P not withstanding.
However they will accept a Visual Report from someone registered with the NICEIC.
The Council Website page which deals with them leasing properties and their requirements, states they will only accept reports from persons registered with the NICEIC, though on the phone, they agree that anyone registered with one of the government approved Competent Persons Schemes will be acceptable.
Apart from safety, my main concern, is that some unscrupulous electricians would use the EICRs to drum up business.
As it stands, other than Trading Standards there is little anyone can do about dodgey reports.
I recall one report which stated that an upper floor flT wired to the 16th edition, was unsatisfactory due to there being no RCDs in the Consumer Unit, no labels on the CU, and that further investigation (by another) was required to identify an unknown circuit.
The quote which accompanied the report was for about £350 to replace the CU, with another £250 to rectify the defects.