I didn't include terms of lease in my room rental agreement but the?
Most landlords would normally have no problem letting you go if you explain that in good faith you now just cant pay, though right now you may represent the landlords best chance of an income to offset the mortgage and other costs (even if deferred), assuming they are being responsible and abiding by self isolation requirements. If you gave an undertaking, and were accepted on that basis, and money has changed hands, that is a contract. A written contract is better, because there is less scope for reinterpretation or convenient memory lapses, but a contract generally exists nonetheless between two people when these criteria are met. That said, there may be local tenancy legislation in your jurisdiction that overrides aspects of your contract that might assist in your situation. I would check with your local tenants association, or possibly citizens advice bureau.