I just received an email from ASOS, I'm not going to use so I just put it here for benefit of other people who might want to order from ASOS. I think it is a code that anyone can use.
This is their terms and condition on the email:
*For 20% off enter promo code LOVINGASOS at checkout. Offer ends 08:59 AEST 30/05/2014. Valid on one order per customer up to a maximum of $1,000. Excludes delivery charges, gift vouchers and subscription to ASOS Premier. Valid on full price items and selected brands. Promo code cannot be used in conjunction with any other promo code. Code can only be used once per customer, when logged into the ASOS.com account this email was sent to. For full promotion terms and conditions click here.