There's not many that I know of. I used to shoot at Steve Smith's up by Newcastle Airport, and there's also Washington Air Rifle Range, but neither of those are particularly close to you. As for FAC rifles, I think Steve Smith's allowed them. I don't think WARR does as it's a pretty small indoor range.
I did hear something about a bigger indoor range opening up in Sunderland (Philadelphia), but I can't find any info on it other than that planning has been approved.