Couldn't think of anything worse than sharing a house with lodgers , but whatever floats your boat.
i understand how sharing once you're settled may feel off, however i see that houses are expensive, and i see that to buy one i will have to accept having people share that space with me for x amount of years. i've shared for a few years now. it has it's ups and downs, but having cheaper rent to me is such a luxury giving me more disposable income to do whatever i wish with.
Why do you need a 3 bed house for two people?
like the guy above said, rent out rooms. think of it like this. lets say we have a 1 bed house and the mortgage/rent is £900 per month. That's my partner and i paying £900 just us. if we have a 2 bed place the mortgage/rent is say £1200. we can rent out the second room for £580, more even if we rent to a couple, leaving us to pay only £620. 3 bed house, mortgage is lets say £1500, but we can now get £1160 from renting out the rooms, leaving just £340 to be paid between 2 people. makes complete sense to me.