Alright, i concede on the part of common law marriage
I figured there would be some precedent on that front, since I know immigration respect common law partners for visas
But I still reckon it’s a little asshole, you would have to establish some basic tenancy agreement- a lot of those things would need to be figured out
As for not paying council tax, so what- the big deal is the equity in the house itself
Also what happens when OP passes away, what’s the guide there, what changes if they do get married?
You either want your girlfriend to be a housemate or your partner
Op needs to have the maturity to figure out which that is,
Or at the very least, see it from her perspective