I can't give you specific advice but you will find the answer in a book published by Michael Gandy: Catholic Missions and Registers 1700-1880, volume 6, Scotland. It lists all known registers, the dates covered and their location as well as details of any transcriptions that might exists.
I don't know if the situation is different in Scotland but some English registers are still with the Parish Priest.
You can buy a copy from all good suppliers of genealogy books.
MacIsaac, MacDonald, MacPherson, MacVarish, MacMaster: Moidart - Inverness-shire. Gillies: pre-1850 Knoydart, Inverness-shire /post 1850s Fort William area - Argyll. Tully, Tulley, Moran, Murphy: Lanarkshire. Durnan, Durnin, Kelly, Tully, McPhillips: Co Monaghan. McIntyre, McMahon, Tully: Co Cavan (?) Ireland. Moran: Co Mayo (?) Ireland. ..........and lots of Spanish name interests........