OK but how do you account for the Methodist marriages pre 1845? (I have seen the Donegall Sq records in PRONI. There's plenty of them for those 10 years 1835 - 1845).
Not trying to trip you up but I am genuinely interested to know how they did that if it was not lawful.
Offhand, I can't other than Wexflyers suggestion they flouted things.
Wex though I said the original 1844 Act and the 1870/71 Acts don't appear on Legislation gov uk I added the same legislation.ie plus a Histpop link at the end wiich has clearer text but can be troublesome to open. There is also an historic pdf print somewhere - just remembered Familysearch
https://www.familysearch.org/search/catalog/247928The 1844 Acts and 1868 Royal Commission definately indicate Presbyterian marriage by banns was possible just rare. Think they say the same for R.C Banns (Wexflyer?). As an aside I know in Scotland the norm was basically to read banns 3 times on one day rather than on successive Sundays per C of E.
Edit doesn't clarify the 1835-44 situation: 1844 Marriage Act:
XLIX. And be it enacted, That, except in the Case of Marriages by Roman Catholic
Priests which may now be lawfully celebrated, if any Persons shall knowingly and wilfully
intermarry after the said Thirty-first Day of March, in any Place other than the Church or
Chapel or certified Presbyterian Meeting House in which Banns of Matrimony between
the Parties shall have been duly and lawfully published, or specified in the Licence,
where the Marriage is by Licence, or the Church, Chapel, registered Building or Office,
specified in the Notice and Registrar's Certificate or Licence as aforesaid, or without due
Notice to the Registrar, or without Certificate of Notice duly issued, or without Licence
from the Registrar, in case such Notice or Licence is necessary under this Act,
or in the
Absence of a Registrar where the Presence of a Registrar is necessary under this Act, or
if any Persons shall knowingly or wilfully, after the said Thirty-first Day of March,
intermarry in any certified Presbyterian Meeting House without Publication of Banns, of
any Licence, the Marriage of all such Persons, except in any Case herein-before
excepted, shall be
null and void.