Lancashire Records Office in Preston has the following:
Baptisms 1839-1950
Marriages 1861-1946
Burials 1840-1919
Searching for baptism and burials is more time consuming as they're not indexed. However, for church marriages, the registers are the same as the registers sent to the superintendent registrar/GRO and so if you search
www.lancashirebmd.org.uk and find a marriage you'd like details of, then the name of the church and the lancashirebmd reference number points to an exact entry in the register (the final two or three digits are the entry number in the register). You could then post a lookup request (on the Lancashire lookup requests board here) and give church, year and lancsbmd reference number, and some kind person may be able to look it up for you.
Some records office offer searches (paid for unless it takes them less than 5 mins or so) and will make copies and send them to you, but looking at the LRO website, they're a bit coy about whether they do that or not. Probably don't want to be swamped.