Hi: I think your best bet would be to telephone one of the Archives - and I would suggest Stoke on Trent if you want local Potteries information. Lichfield Archives does have copies of the parish registers, plus the Bishop's Transcripts for the whole of the Lichfield Diocese, but I would strongly recommend that you telephone them, the staff, certainly at Lichfield, are very helpful and knowledgeable, and they will point you in the right direction.
BumbleB