I lived on the Yorkshire Coast for many years, and I remember Simon Boak's name appearing on promo posters over twenty years ago. He has been around for a long time, mostly promoting Country Shows, Traction Engine Rallies etc.
I have vague memories of dealing with him with no problems.
Unless his business has collapsed drastically this summer, and that is possible, I would say that you should not give up hope.
It will be strongly in Mr Boak's interest to maintain his good name in the area.
Cheers
Dave