We live in a rented property, and the back door has aboit 1.5cm at the bottom where theres nothing there IYSWIM, so all the cold is coming in and making the house freezing, tried a draught excluder to no avail, Landlord said it's not his problem? Its also got a square hole in it that's been bordered back up, an old cat flap. Does my landlord have to do anything to remedy the problem or is it on me?i could attach the bristle things that are supposed to be under the door? Thank you