My sister has had to move in with us because she has a chronic illness and can't afford to rent in London. She has just found out that her landlord failed to register her deposit with any Deposit Protection Scheme. We have researched where she stands but we still have a few questions if anyone can help? Her landlord is deducting £1000 for cleaning (which the flat didn't need as I paid for cleaners to go in myself and they did a great job). Do they have a right to do this or does their failure to register the deposit mean they have lost this right? If she pursues this to the County Court could she potentially lose the case even though the deposit definitely is not registered (we have checked all schemes and the landlord has admitted not doing it)? How would the judge reach a decision about compensation- could issues like the terrible mould and no heating have any bearing or would the judge only consider issues directly related to the deposit? We have had some help from CAB and Shelter but any further advice would be great.