Taken from the signup page -
Join here via our online catalogue sign up promotion and we will send you a $25 voucher to spend at Wallace Bishop.
Being a Gold Card Member means you can save 5% on every Wallace Bishop purchase, all year round and even on already reduced stock. We will also send you special previews on all our great savings and the opportunity to take part in exclusive Gold Card member promotions
If someone wants to join the Gold Club, there's another promotion, where you and whoever referred you get possibly another $25 voucher each. Maybe talk to Moo and Moo could invite you. Alternatively you could contact me :)
Looks like there is something in the terms and conditions though, where only one voucher can be used in a purchase and only one voucher may be used per person.