Ok, thanks for the replies, chaps.
The owner is more a customer than a friend, and he said he bought it over 6 months ago, so the complaining to the seller boat has well and truly sailed i think.
Anyone know what Naim dealer is best to deal with in the UK?
Any authorised Naim dealer can help, with support from Naim, and can supply spare pucks, link plugs etc. Just find local dealers via Naim’s website.
An authorised repair would be via a dealer who would return to Naim service dept if necessary, although you may decide that the cost isn’t worth it. Also try Class A in Sheffield who are Naim authorised and may be able to help.
Some dealers can supply cables, pucks etc by post, TomTom Audio in St Albans are worth a try, but note that dealers will not supply electronic components for DIY repairs.