Stockwell & Co Still Water. 2l for 17p at Tesco

Don't buy 500ml of Evian for almost a quid, walk to where the water is stocked and you can have 2 Litres of H2O for 17 whole pennies.

And yes it is 'Sourced' from the Chase Spring in Staffordshire. I cannot comment on whether it compares to Peckham Spring water at this time.