I was typing a similar post to
@pc1966
My opinion:
'the absence of supplementary bonding in the bath or shower' etc.
Becomes non-issue most of the time once a new consumer unit fitted and all circuits in room have RCD protection.
'the absence of earthing at socket outlet',
Can be anything from a wire fallen out to a bigger problem. Needs investigation to determine. Not normally too bad.
'a ring final circuit having a discontinuous conductor'
Needs investigation, if can't be easily resolved there are normally easy workarounds (split into two radials)
'absence of a circuit protective conductor other than a lighting circuit, supplying class 1 equipment.
This gives an idea of age of wiring - up to 1965 ish. If not lighting this needs looking at with urgency. It might be linked to the socket without earthing above.
'unsatisfactory electrical connections, such as type, number and size of conductors unsuitable for the means of connection'
'adequacy of cables for current-carrying capacity with regard to the type and nature of the installation.'
My reckless guess is these relates to size of main tails or earth. More info needed to determine. Quite often size of earthing and bonding on older installations are smaller than would be installed new. If it is that a board change would review these as part of the job.
In all circumstances I would plan on around £500-600 for a new consumer unit with RCD protection. That buys a lot of peace of mind while issues are investigated and plans made.
The last three issues are the main ones that concern me, the others can likely be sorted out or worked around.