Price of one bag is £2, but Tesco is offering 'Buy 2 for £3'. Then an additional 20% is taken off with the current "20% off all gardening" offer.
The 20% is based on the full price of 2 bags.. ie. 2 x £2 = £4 x 20% = 80p. I guess it would be easier if I just took a photo of the receipt and loaded it up... but that's just too techno techno for me.
It's like Christmas has come early.