Although there are some visual clues that can help you to determine if a material may contain asbestos, the only foolproof way to determine its presence is through laboratory analysis. There are professional services that you can reach out to that can help you with this.
You'll need to take a sample to be analysed under Polarized Light Microscopy, but removing the asbestos sample can be dangerous and as such should only be done by a professional. Once you know you have asbestos, you should contact a removal service in your local area. If you live in Nottingham, try searching for asbestos removal in Nottingham to find a company that can help safely remove it for you.