I know I posted this before but I have just received an email with the UNIQUE REFERENCE NUMBER. It worked for me and may work for you
Support England with a Stanley supporters pack
To claim your Supporters Kit:
1) Log-on to http://www.stanleyworks.co.uk/promotion/supporterskit
2) Complete the entry form. For this you'll need to enter the following URN: DX69283749
3) Enjoy the World Cup!