Tesco do the same.
This week they are doing a promotion, spend £40 or over and get £5 off your next shop.
I fell for it, and had a delivery today, spending £42 and on making out my order today for the w/end, they have stopped most of their meals of buy three and save £1.50, ( buy three for £6 ), which have been on offer for most of the year.
They have also put up lots of items by the odd 20p, 30p and 40p that I usually buy. So really I am not saving hardly anything.
I suppose you could say, well that's ''Business'' but in reality they are giving you nothing, so its a con!
Every little helps, PIFFLE!!!!!
http://www.dailymail.co.uk/news/article-2509664/Supermarket-deals-cost-MORE-Multi-buys-shoppers-impression-saving-money.html