Denil963 I think £230 is not a lot to retain towards both the cost of the carpet AND the damaged window. As others have said, he would have to go to the small claims court to try to get it back.
It is hard to think why you would not have insisted on inspecting the room periodically.
Be more proactive if you take another lodger.
All landlords, whether of lodgers or tenants have responsibilities and rights. The rules have changed. If anyone reading this has not checked up lately I urge them to do so,
Medical Ailments (Oct '23) A-Z
To think that London, or anywhere else for that matter, does not belong to any one demographic