Since there seems to be some interest, and just to get the ball rolling. I have put a couple of links to good tried and tested (by myself) MTB trails.
Also how does either Sat 13th October or Sun 14th October sound for a date to go riding (weather dependent)
In my opinion Llandegla is the better option, reasons being is nearer and smaller in size (I am yet to fully complete the Marin trail)http://www.cycle1st.co.uk/llandegla/llandegla.htmhttp://www.cycle1st.co.uk/reviews/marintrail.htm
or there is Delemere Forest
Of course knowing the nature of forums and people commitments to other activities this could go down like a lead balloon, we shall have to see
(copy, paste and add name)
Names of people coming:-