I live in a bungalow with double garage attatched and joined onto that is a "granny flat " that was used by my late inlaws.Because it is attatched and in the same grounds as my bungalow it is exempt from paying rates (although rated at band A ).I am concidering renting it outmainly so someone is "on-site" when we are away as its out in the country.Any tips on what to be aware of when renting out as have heard some sad tales?