I'm a member of Tunstall and Rendelsham Offroad Group (http://www.trogmtb.com) and we ride in our local forests. OK it's more XC than MTB but lots and lots of singletrack. We have about 20 riders on a Sunday morning and we'd be pleased to host a weekend for you guys if you fancy a weekend away,
I can recommend B&B, hotels or there is a camping ground in the forest with fire pit that you can have sole use of.
Oh - and we have great beer down there!
I work for a local company and so spend a bit of time up here as well (although rarely a Wednesday
) so hope to catch up with you soon.