Big up to the club for once more making simple things tougher.
Email - your membership will not auto renew, you need to enter new payment details (as they now process them directly).
You can do that by clicking HERE.
Only you can't, because that takes you to a page where you update your name and address, but not your payment details.
Also - cost of membership £50. Which become £52.95 when you check out, with no explanation of the no doubt utterly spurious surcharge added on.
Honestly, this shit should be simple.