Great advice, and when he's caught banging her sister and ends up with a psycho hose beast on his hands he loses half the house.
He does not, there are no common law wife in this country. If she contribute towards the mortgage directly then there might be grounds for some dividends if she gets a good lawyer but anything she get might be sucked up from legal fees anyway if she pursued, unless the contribution is regular AND substantiate for a length amount of time.
To remedy that, just call any money she contribute rent and household expenses.
Rent your place out to another party and find somewhere mutual together?
Ok, she said she wants to contribute, so I won't bother with paper work. Instead, she can give it to me in cash just before I go out for the evening to visit the local gentlemans club.
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Get it signed and sealed by a solicitor. You don't have to be married for a live in partner to have a claim on your house.
Have you read the thread? Specifically the bits where this has been debunked?

"It seems to me, although the Defendant has been the bigger wage-earner over this very long association between the parties, they have both put their all into doing the best for themselves as they could. In these circumstances after such a very long relationship a 50/50 share is . . . an appropriate division of the net proceeds of sale."
So you should rephrase that to, depending on the amount of income this guy is wrong. Or you could just not say anything since that's a lot of "ifs"![]()
Welcome to tax! It's all about the ifs!
And no, the key point in whether you get taxed on your income is not whether or not that income is derived from a contract.

What or who is that?
Pay particular attention to Stack vs Dowden case which is in fact that opposite as she had all the money compared to him. She had a house and a mortgage and all the bills were in her name and they had seperate bank accounts. He won his case for 50% of the profit on the sale of the property when they split up but was later on appeal reduced to 35%. They had been together but not married for 28 years.