Well I did a recce of the Nawton loop as Fluffy suggested and apart from the weather it should make a good ride, mixture of up and downhill, a few very quiet country lanes, some grassy fields, some open moorland and some wooded bits, very varied terrain (especially as it pissed it down most of the time), did a tad over 20 miles in about 5 hours but would have been a lot quicker had it been dry. If we want to put it in the calender then let me know.
Matthew