Pohutu welcome aboard! Great to have someone in the cabin who knows what they are talking about - otherwise I'll just carry on talking rubbish.
As it happens, I do know something about marriage laws as it is a (small) part of my work. The marriage laws in Scotland were changed in 2006, which is why that aspect of history was expunged. They also removed an area of discrimination (regarding secular marriage) that still persists in the rest of the country, but I won't digress any further.