Finally found it
Energy price cap will rise by 1.2% from January | Ofgem
looks like it is full of little adjustments ( extra bits of profit )
EBIT allowance = Supplier profit
Payment uplift = extra profit for suppliers
adjustment allowance = extra profit for suppliers
headroom = extra profit for suppliers
levelisation allowance = extra profit for suppliers
Wholesale is around 40%, as I understand it that's what we should be aiming at with our Ripple payments