Yeah 3 of us rent rooms in a house, our 4th roommate is the landlords son.
I have done these informal lets before and they have been fine, in fact in 9 years I have never lived in a house where the landlord has put rent up during my stay but I have moved around a bit.
I spoke to a solicitor today and I will send him our ‘contract’ to look at tomorrow, his initial assessment is that the contract is not legally binding so he can do what he wants but maybe try and negotiate.
I could move but the house has a secure garage for my bike and there isnt so many other options where I can get use of a garage.