Hi TT, hope you are well, I grew up in Ormskirk, the Parish Church of St Peter and St paul was in existance when Henry V111 overhauled the parish record system and the keeping of detailed records by the inmcumbant or his parish clerk was done to a standard register system. Elizabeth 1 then established the BT system in the late 1590's, this meant that the Bishop visited each parish quarterly and a copy of the registers for the previous season/quarter was made and taken to the Diocesan archive. It is more likely that the BT's survived due to the better conditions for storage over the centuries. BT's have mainly been filmed by the dicesan office over the years and then deposited with the CRO more recently, St Peter and St paUL'S btS should be in Bow Lane and I know I have searched them there, the IGI mainly covers baptisms and marriages up to around the introduction of civil registration but you may not pick up early 19th C entries from the IGI.
I was confirmed at Ormskirk Parish Church, it is very interesting and you should pay a visit, the graves in the church itsself are amazing and the whole building is unusual, look for the raven on the wall outside, we had a day there from our school when I was about 8 and we found it then, I went to the Parish school too.
dotty