Peterlee/Shotton Colliery is easy enough with a Warrior. Tarmac strip is very narrow though, less than a wingspan, but this does help in concentrating the mind for a good landing. Taxiway is fine as long as you're careful. Easy enough to find as it is virtually next to the A19 dual carriageway and has 2 large wind generators about 1.5 miles away to the SW.
Only thing I would say is make sure you PPR as they are not easy to raise by radio. It is simply a bloke wandering around with a handset who may or may not hear you and answer your calls. Friendly enough bunch there though.
Newcastle simply isn't worth the rip off handling fees (you have no choice about it either) and Teesside is too far away to be a realistic alternative. It's a good trip, and there is no shortage of diversions up the eastern side of the country if you need to cut it short for any reason. And forget all this VOR to VOR at flight level nosebleed stuff, what a waste of a perfectly enjoyable VFR trip.
