Tesco grocery customers will automatically get the price difference if their shop would have been cheaper at Asda, Morrisons or Sainsbury's. But how does it compare against rival schemes?
Eight of the UK's biggest supermarket chains have agreed to fairer pricing policies, including not inflating prices to make a later discount look attractive. However, Asda is stalling.
Millions are being walloped by energy price hikes this winter, but it's not just the big headline-making firms upping bills. Hundreds of thousands of households are also being hit by smaller companies increasing costs as well.
Update, 13 Nov 5pm: Derbyshire Building Society this morning matched Sainsbury's rate, and is now offering 5.4% on £7,500 to £15,000 loans paid back within five years.