Scottish Power customers are awaiting a total of £8.5 million in compensation today after regulators found the firm misled tens of thousands of households over its prices.

The energy retailer admitted yesterday to luring customers with unreliable comparisons of yearly fuel bills - but fuel poverty campaigners said the market itself was the real rip-off.

Industry regulator Ofgem found that Scottish Power's door-to-door sales and telemarketing campaigns between 2009 and 2012 failed to provide an accurate formula for estimating household consumption or accurate comparisons of its own annual charges alongside those of competitors.