Finding a Marriage Cert

[Horsley2016]

Dear all,

I'm trying to get the details of a marriage between Thomas Morris and Mary Kelly in Liverpool on 15th Sept 1851. Frustratingly, Ancestry gives me the outline details but I can't see the transcript and therefore any of the details! I know I'll probably have to resort to trying to order is (as it's an important confirmation link potentially) but wondered if anyone had any help / ideas to throw into the pot to try and find out a different way?

Thank you! 
M

[Comberton]

Thomas Morris
parents Thomas & Esther
witness Michael Connor
Mary Kelly
parents Thomas & Mary
witness Mary Connor
priest William Ball
It is a Catholic marriage at St Anthony's
image on Ancestry

[AntonyMMM]

An image of the (Roman Catholic) church register is on Ancestry - at S Anthony's.

She is indexed as Mary Shelly.

As with many RC records it names both parents of each party.

[Horsley2016]

Thomas Morris
parents Thomas & Esther
witness Michael Connor
Mary Kelly
parents Thomas & Mary
witness Mary Connor
priest William Ball
It is a Catholic marriage at St Anthony's
image on Ancestry

Thank you so much. I don't know what I've done wrong on Ancestry!  I did a search on names and
a date range and it came up the the bare bones but no image etc. However, I wonder if it's because I ticked 'exact' under the name Kelly if it was indexed as Shelly?!! 

Thank you again - much appreciated you taking the time to have a look.
M