Have been investigating magnetic secondary glazing for a single glazed period house in conservation area where we don’t plan to replace windows for a few years. Can anyone help me understand how it would actually work with these windows of which I have attached pictures where the handle to open the windows appears to protrude inwards towards the house? I rang One of the companies and they said that all Window furniture like handles would need to be removed but that makes me wonder how it will be secure because if the handles are removed then somebody could surely open the windows? Or am I missing something?