approx 30% disc ,, not to be sniffed at ..
Im not sure but i think the disc percentage rate depends on consumed units and is on a scaled system ..the numbers below ring a bell but again not totally sure my info is correct.
Maybe its just the April bill that is as the Feb reading.
150 under free leccy
150 to 800 / 50% disc
800 over / 30% disc
DM