Leaving a rented property without giving notice is called 'abandonment'.

Abandoning your tenancy doesn't end it. Your agreement with the landlord continues and they can continue to charge you rent.. The landlord is obliged to notify the council and DWP if they believe you have abandoned the property. The money paid towards your rental costs through benefits will be stopped, which will then cause rent arrears for which you are liable.

Your landlord can hold you responsible for paying the rent until you end the tenancy properly, or the property is re-let. Your landlord can apply for a court order to make you pay what you owe.

If this happens it will make it much harder for you to find a new home.