http://england.shelte...nd_subletting/lodgers
If they are a lodger, not a tenant/subtenant, they have very few rights. You can just give reasonable notice and throw them out. He would have no right to stay put. At very worst you would have to get a court order and get him removed.
You could make them sign a lodgers agreement...? Or if he's paying you rent, he's a tenant. It gives him more rights, but also you would have a proper rental agreement with termination clauses in it.
If it all went wrong, why would he want to stay? I would discuss this rationally with your daughter.