I'd doubt that Lancs BMD would have been allowed to view the actual Registers but perhaps had access to the local Registrars index which would give them the Register No and possibly, where applicable, which Anglican church that register was from. Anglican Churches were the only ones who did not need the presence of a registrar to fulfill the civil requirement for the marriage to be legal.
Non conformist marriages, at that time, needed a registrar present to cover the civil requirements but those civil registers would , I imagine, have marriages from various churches therefore Lancs BMD would not be able to tell if the marriages in those registers were at the Registrar's Office or a non conformist church.
Boo
