That's a non-issue, Barshifter. Weather cannot be booked anywhere in Western Europe. Organisers waiting for guaranteed fair meteo's will never organise anything. And I do not think Morayshire should be worse than any other place.
OTOH we must admit that weather is more critical to ultralights than to the average Cessna or Piper. Couple of weeks ago I cancelled my flight to the EBBT fly-in due to strong winds - you will imagine my regret, I drove there, instead - PPL'ers were all there, but very few ULM's.