No apology needed! It's true I was a little frustrated initially as I'm not as skilled at searching eBay as I should be and I must have been using the wrong terms.
However, I have various contacts who trawl eBay for a variety of boats and two people notified me independently about that one yesterday. It was Daren that got in first.
I do have an eBay search set up for:
seahawk, sailing boat, Located in: UK Only
and I get mailed any new listings, but this one escaped me because it wasn't identified as a SeaHawk.