A good free site is familysearch.org, it's the site of the Mormon Church who have a huge amount of information, a lot predating 1837, the date of compulsory registration. Also these are a number of Online Parish Clerk schemes all over the country, if you google lan-opc it takes you to the Lancashire site and down the left side there's a link to other sites.
Ancestry also gives a 14 day free trial very often, which would give you a good start, remember to cancel before the end though. With different cards, you can manage a few 14day free trials!



