My 6x Scottish grandparents were married irregularly but eventually in 1759 went to a church to be married.
The Doddington Church record reads:
'Alexander Greig and Helen Aitchinson, irregularly married, were rebuked and declared married persons and gave to the poor' The amount given to the poor was recorded as one shilling and sixpence.
The irregular marriage required two witnesses and was done verbally. It was usually a Blacksmith and his assistant or wife, as the witnesses had to be Scottish citizens, and only Scottish citizens could be Blacksmiths as they could make weapons of war, swords, shoe horses, etc.