It's about £500 per household per year we pay towards their profits.

Their profit margin is about 20-25%. Tesco's margin is about 5%, by contrast. In other words they can afford a haircut of about 50% and still have a profit margin more than twice that of the country's biggest supermarket.

There's ample room for price controls and forcing them to pay for infrastructure, rather than letting them pass it on to the people.