What is my membership number?

I am not sure of my membership number, is there a way that I can establish my membership number?

This number is seven characters made up of the first three letters of your surname, followed by your beach hut number. If your beach hut number is only two or three numbers, enter 0 or 00 to make up to seven digits. For the few members whose hut number is four numbers and a letter, please use the first two letters of your surname.