If your a registered user , then the club doesn't recognise you as a member per-se . Registered users are afforded access to certain areas of the site , this is subject to change without notice
Full/Paid members- You can access your membership invoice HERE
The link will take you to the Membership Details page as shown below, clicking on the circled invoice number (if you have more than one it's the one marked active you want) will allow you to download a copy of of your current membership invoice (in pdf form) which includes your membership number. Most if not all insurance companies accept this as proof.