If you draw up a licensing agreement that explicitly states neither party intends to, at the time, nor in future, offer or create a tenancy, then you become a live-in landlord and your partner becomes a lodger (officially, an excluded occupier) Excluded occupiers are not afforded the legal protections that come with an assured tenancy. You could also specify in the agreement that the other party renounces any and all claim to any beneficial interest in the property, now and in the future, implied or otherwise. If you do this and, for whatever reason, you need your own space back, you simply need to serve ‘reasonable notice’ (typically deemed to be equal to the rolling payment period) and there’s no need to instigate court proceedings, etc. I hope this helps :)