Ah, thanks! I was browsing their front page and offer page and couldn't spot it. (embarrassed)
TAKEOFF5 £5 off £50 spend plus £5 Amazon voucher via Vouchercodes
Can't find any information about that AFEXTRA20 code even if a few perfume deals have been posted with it, on which items can it be applied etc? Any chance you happen to know? Can't find any information on their homepage. Tried it with another perfume I've had my eyes on and it didn't work.