Many thanks for the replies.
bukvalu.com doesn't appear to cover
boats outside the US/Canada.
jdpower.com didn't recognise Finland's Siltala as a manufacturer; Nauticats aren't that rare?
We've never had info from a
broker, but a couple of surveyors have been seriously helpful; I assume they need the info for a reasonably accurate valuation?
I'm not sure how useful the asking/sold info is, as a boat's value (at least in the eyes of the seller) can be plus/minus £$10-20k depending on toys such as watermakers/aircon/Starlink etc.