Is there an index to marriages in Douglas in the 1820s?

I am trying to locate the wedding of my 3 x great grandparents, Thomas Collister and Elizabeth Cannell.

They had 9 children (that I know of) from 1829. These children were all christened at St Mathew's in Douglas.

Can anybody help please.

many thanks - Allen Blakeley (IOMFHS 08/8991)