I know it's not strictly in the Christmas period, but might I suggest the first weekend in January?... travelling in that week between Xmas and New Year is horrible, cant remember how long it took us, but when we came to the Stoke meet (2012?) it took us ages to get there and back, seem to recall it was around 7 hours each way, the stretch south of junctions 20/21 on the M6 were just gridlocked. Picking that weekend would also solve any family related obligations around Xmas as well I guess. I would be happy with either venue, but I rather enjoyed the Trentham Gardens location