Hi Jim,
We went to Old Hartley last year.The site slopes quite a bit so be prepared with some chocks.We had a pitch next to the fence overlooking the bay with views to die for.Usual first class CC facilities etc.Loads to do in the area, cliff top walks etc.
Can recommend the metro train to Newcastle and Alnwick castle and gardens are a must!.Light house in the bay is also worth a visit, which if you have a head for heights you can go up.
Only problem we had was that 7 days was not enough!!!
Hope this helps and enjoy your hols.
Regards Nidge.