Your unique lifelong membership number is 10 digits long and will generally start with ‘10’. You will be allocated this lifelong membership number when you first join a club.
This number was formerly known as a CDH number. If you have previously been a member of a golf club you will not need a new number. Your previous membership number remains attached to you and will be re-instated along with your previous scoring record, if this is available.
If you can't remember your membership number you can ask your home club to look into this for you. Alternatively, if you have previously had a membership number and are now unsure of this, your last golf club will be able to provide details.