Moving... Not

So. You find a house. You agree to rent it. You put the holding deposit down and sign a piece of paper about the holding deposit. The landlord accepts your offer and you agree the rent. You've put down your holding deposit, and the landlord asks you some questions about moving in. You give notice to your current landlord.

Then the agent passes on a sale offer to the new landlord, who accepts.

Leaving you stuck.

Great, isn't it?