A simple question.

spiro

The rules for quoting average increases are set up OFGEM so that all suppliers use the same formula. You need to bear in mind that this covers various tariffs and payment methods and therefore is reflective of the number of customers per payment type that any single supplier has. As an example if a supplier has a high percentage of PPM customers compared to credit and increases PPM by a low percentage then this will pull down the overall average increase.