The club is called Breckland
www.brecklandlrc.com/They are an active, friendly bunch. We (Essex Land Rover Club) had our Easter event on one of their sites for a couple of years.
You should drive at least some of the Peddars Way, which is an old Roman road, and easy to find on the maps. But some of it is not now a byway (or at least not passable by a LR) so be careful.
BTW, all LandyRallyers, if you want to do some off roading at Easter, check out the ELRC event at the Secret (!) Nuclear Bunker http://elrc.info/easter2010/
This promises to be a long and Dirty Weekend. And DirtyWeekenders will both be there.
We're going all the way, again! But no camping, and I'm giving my shewee away!