Ask an Property Solicitor. Get an Answer ASAP.
What type of contract is this?
I can call you but it would be helpful if you can give me more information now so that we can ascertain whether it is my area.
Do you mean an AST?
Ok. Where would you live if you couldn't move in?
Ok. But could you stay there if need be?
I will try calling now.
I don't actually have your number?
It will. Is that OK?
Well, they are in breach of contract. You rented this property. You are entitled to occupy.
However, the fact remains they are refusing. If you were living there they wouldn't be able to get you out on this basis but you haven't moved in.
You do have a claim for the sum of the loss. If you had to rent elsewhere at a higher rate that would be claimable although you would have to prove that you tried to mitigate your loss and could not.