Hi Laurence,
Sorry I didn't reply to this earlier, I missed it somehow, hopefully you have by now found the solution elsewhere.
CE approval , as I understand it, it based on compliance with the Recreational Craft Directive, of which the first edition was issued before your boat was built, soshe will not have CE approval, but, in my mind doesn't need it, having been built before the concept of CE marking for yachtswas dreamt up.
Actually, what you need for the UK is not CE marking but UKCA marking which would be based on compliance with the UK Recreational Craft Regulations (RCR) which, as far as I can establish are, in practice, the current issue of the EU RCD with a new title. These regs should have come into force on 31 December 2024 but recognition of the RCD and the CE mark has been extended more or less indefinitely as we don't employ enough civil servants rpto make this happen across the industries which were regulated this way in the EU. Why nobody bothered to estimate the regulatory work required of both industry and regulators across all industries before the Brexit vote is beyond the scope of this forum.
Sadly, the idea that a boat may have been built before the first RCD came into force is beyond the understanding of some officials, but other officials can be very helpful in this respect. I trust you can find a good official in UK HMRC to help you with the import of Blithe Spirit.
Peter.