This is the largest size of Ariel gel with actilift and is in the Hamilton Savers store for £3.99. Not sure if its in all stores but it has been in this store for a few days now. Excellent price. Sainsburys are currently doing this 2 for £13 on a special offer as they are normally £8 each.
Also they have lenor 750ML size (21 washes) for 99p.