I have just discovered that Jane Henderson Crum was the daughter of the late Mr Wm Crum, and although born in Scotland, lived the greater portion of her life in Dunoon, Argyleshlre, Scotland, where she was for many years in the employ of Messrs. William Maltham and Co, (fishmongers), She returned to Glasgow on her marriage.

So the marriage may have occurred in Argyleshire (I have no idea where that is) - but as their first child was born in 1903, I guess the wedding would have taken place around then.