The rear stabilizer fell off while I was winging at Locarno today. It is a Lift Back Wing - 38 Surf V2. I think it sunk to the sea floor, but as there is now a flood tide and I wasn't far offshore, there's always a chance it will wash up at Jericho or Kits.
It was operator error, I didn't tighten the bolts properly, but I did prove to myself that I could foil for a decent distance without it, so maybe it is time for a smaller one anyway.
If found, please message and I'll supply beers.