Ann Robinson, of price comparison website Uswitch said some customers could ration their energy usage as a result.

BBC: Scottish Power to raise gas and electricity prices

In response, Ann Robinson, chair of the gas and electricity consumer group, said that mis-selling was still a bugbear for many UK consumers.

BBC: Energy firms still 'duping' consumers

Ann Robinson, of price comparison website Uswitch.com, said she was disappointed because smart meters would have "huge benefits", but added that it was "more important to get it right so that it works for consumers".

BBC: Smart meter project is delayed