The paperwork contained two letters, one for the old tariff rate of 42.8p/kWh and the other for the new rate of 44.85p/kWh.
The first payment is for 488 kWh between 25th Jan 2011 to 30th Mar 2011 = (488 x 41.3) + (0.5 x 488 x 3) = £208.86
The second payment is for 188 kWh between 1st April 2011 to 25th April 2011 = (188 x 43.3) + (0.5 x 188 x 3) = £84.31
This makes a total of £293.17.
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