Operator brings in independent legal firm to look into whistleblower allegations relating to June heatwave

Great Britain’s grid operator has brought in independent investigators to look into accusations that its staff were involved in a cover-up over the power system being at a greater risk of blackouts during the heatwave.

The government-owned energy system operator will face the scrutiny of an external legal firm after a whistleblower claimed that control room staff were warned against leaving a paper trail relating to efforts to stabilise the power system during record high temperatures in late June.

Asda, Amazon and B&Q among retailers in talks to sell devices that feed into household sockets and can cut electricity bills by 30%

• Spanish homes save €10 a month via renewables expansion

Bosses of some of Britain’s biggest retailers are discussing plans with the government to start selling plug-in solar panels as part of a drive to encourage more UK homes to generate their own electricity.

Executives from brands including Currys, B&Q and Amazon met Martin McCluskey, the minister for energy consumers, on Tuesday to discuss guidelines for selling “balcony solar panels” to the British public.