Instructions:Found this code on an ancient post that had been expired, and gave it a go - bingo! Gave £3 off a £30 dress and £4.50 off a £45 dress. Don't know if there are any restrictions or if it has a min spend as I don't know anything else about it.
I think it may only work once or twice per person and that was why it stopped working for those using it in the past.
Can't find Warehouse on Quidco/TCB/Quanti, but if anyone knows of a cashback site they're on, let us know!