I can remember Woodhouse Farm from the early 80's, was one of my favourite venues too. Always remember in A class it was a struggle to get a 175 up "the big red hill". Used to be able to practice there too. Looking on Google Earth, and some recollections of my last times there, think the house was swallowed up by the big pond.
Was talking to somebody a while ago who said the enduro boys were paying silly money (to us tight fisted trialsriders) to compete there. Owner had been approached about holding trials there but asked for the same money as an enduro, making it unfeasible for trials - real shame as it would still be a great venue.
Gaz, I can remember most of those venues too - and you and your Dad (and his beard)! Many memories of you on your Fantic 201. Hope you are well.
What a fantastic range of venues we had to hold events at in those days, pity some are gone now as I am just starting to ride again.