My daughter has a student flat which is on the sea front and below ground. Due to flooding the other week they boarded up her outside door, so only has one exit. There is no windows apart from the one above the boarded door. 

Can you tell me the law on this as we are looking at moving her out but not sure about breach of contract. The only part of being unfit for purpose. 

thanks

Without knowing the layout or surveying the premises it is impossible to give a definitive response, a single exit could be acceptable or not it would depend on a number of considerations.