Fire Escape advice conflicts with Landlord Accreditation advice

Other

I have student rental houses - not HMOs as they are 2 storey with 5 or under tenants and my local authority does not require them to be licensed. I recently had an inspection from an accreditation scheme that I am trying to join. They have asked me to put a bar or restrictor across one or two of the upstairs bedroom windows in rooms where the window is quite low in relation to the floor. They argue that a person could fall from the window through sitting on the window sill or leaning out because the sill is quite low down. However, the fire escape authorities advise that the upstairs bedroom window should be a means of escape and if I put a bar across, am I not effectively removing the possibility of people being able to escape from the window?