ios15
Couldn't find any active codes for ASOS and stumbled across this on Twitter. https://twitter.com/AsosPromoCodes/status/662943870150434817
Per the screenshot attached (because, hey, it's an app and can't link to that). The code's prominently displayed in the app, but wouldn't have thought to check there before purchasing (when logged in my desktop cart jumped across to mobile, so no re-finding all your items).
Fineprint in the app: "Use promo code ios15. Offer valid on iOS app only (tried the desktop site, and they're telling the truth). Ends 7pm AEDT on 13/11/2015. Exclusions may apply. Full-priced items only."
Link to iOS app:
https://itunes.apple.com/au/app/asos/id457876088?mt=8
Sigh, murphy's law - there's always a promo code a couple days after you make an order!