Members of the Irish Ancestry Branch of Manchester & Lancashire FHS have transcribed details of baptisms, marriages and burials at several Manchester RC churches. MLFHS make them available to purchase on CD. See the bottom of this page on their bookshop site,
http://www.rootschat.com/links/0kfp/ and the top of the next.
If you have lots of RC ancestors in Manchester it may be worth considering a purchase.
On the MLFHS membership site
http://mlfhs.org.uk/index.php if you go to Online data at the top and then click on the Public Data link, you will see another link for their Catholic Register index. This gives you the opportunity to search the index for a name to find out if that name appears in the records that they have. It will not give you all the details, but will tell you if the name is there or not, and presumably whether it is worth purchasing the relevant CD.
I have searched for surname Baker baptism 1825 +/- 10, the only Williams came up as 1828 and 1829, both Manchester, St. Mary, Mulberry Street.
A search for surname Harrison baptism 1830 +/- 10 give 1 Catherine 1828, Manchester, St. Mary, Mulberry Street. The same search for surname Jackson does not find a Catherine.
Searching for the marriage 1860+/- 10 does not give an appropriate result.
