They've blagged 2,500 coupons for £3.60 of free 800g Fairy non-bio washing powder (that should make it free apart from in expensive shops, where you'll need to pay the difference).
Who can get it? Anyone with an iPhone or Android phone as to do this you'll need to download and register on the Shop Scan Save app. If you've already got that, then sorry, you can't take part in this deal.
How to get it:
Download the app via this Shop Scan Save link.
Where can it be redeemed? It's not for the big supermarket chains - but you can get it from smaller stores such as Spar, Nisa, Co-op and Londis by showing your phone. If a shop refuses to accept the voucher (it shouldn't happen, but you never know) contact Shop Scan Save and it'll have a word on your behalf.