Also, please explain why you believe the source which you failed to understand has a licence compatible with OSM:

"All content on this website ©1996-2016 Nuffield Health or used under licence. This website is protected by copyright. It is published by Nuffield Health and may not be reproduced other than when downloaded and viewed on a single device for private use only. It is not to be otherwise reproduced or transmitted or made available on a network without the prior written consent of Nuffield Health. All other rights reserved.    "

https://www.nuffieldhealth.com/terms/nuffield-health-website-terms-and-conditions