Received the email below. Have tested without an account and it looks like you need to sign in. Not sure if it's targeted or not, hopefully, someone else who has not received the email can log in and test.
To say thank you for being a SUPER club member, we want to offer you something extra! An extra 10% off online.
See below for all the details on your coupon code and how to redeem it.
Be quick the code expires this Friday 2nd February.
Happy shopping!
The Supercheap Auto Club team
Didn't work for me, could be targeted?