Apart from studying the parish records and having a nose around the churchyard, i'm not so familiar with felton history myself Mike. (another project on the backburner)
I seem to recall that felton park had a catholic chapel belonging to the local bigwigs at a time when catholisism was discouraged.
Regarding the churchyard, there are some stones from 1750's, most are in poor order. A transcription would be good to have (there may be one in book form at woodhorn pit)
Anyway i had a drive over to felton to take a photo of the church as the board had no threads and managed to knock down a fencepost with the van. I had the vicar on the phone this morning to arrange a time to repair it. I'll see if i can get him on the site, he will have some info no doubt.
Pete