Hi Clive
Years ago, I think the "Annual Model Engineer Exhibition" used to be held at Wembley (back when we used to have 'tool-making' apprenticeships ) – all 3 halls full in it's heyday…
So, it could be that your model is a 'one-off' made by a model engineer ?
As Ray says, some more photos (and /or, dimensions) would help.
I'm new to model yachts, although I have sailed full-size, but, there are plenty of experts here who may be able to help further.
Regards,
Dave