Leapfrog over that missing marriage
Find your relative in the census if you can’t find their marriage: I found that Elizabeth Stone married Thomas Lakin even though that marriage probably happened in India (and still hasn't turned up there); I found that Laura Emily Collins married James Young even though that marriage probably never happened at all.
Here's Laura at home in 1891 - I only spotted her as she was in the same household as her sister (who later proved her will). I'd not have found Laura or her wonderful will without this census entry.
I had heard that Elizabeth settled in Oxford and had a lot of boys (mostly girls, actually!) But I couldn't find her marriage, or anyone in 1901 that matched her description, born in Secunderabad. So I searched all Elizabeths born in India, and was later able to prove that Mrs Lakin was ours.