Marks' arrival in Plymouth has led to Brian McKenzie being released from his contract with the Raiders, ensuring the club stay within the limit of three foreign players.

BBC: Plymouth Raiders sign American guard Chez Marks

But RAC Foundation executive director Edmund King said it would be difficult to set a legal driving limit for cannabis as traces of the drug can stay in the body for up to a month.

BBC: Call for drug-driving limits

Mr Huhne said the government would aim to encourage new entrants into the energy market, make clean energy more attractive to investors, develop reserve plants to ensure "the lights stay on" during periods of high demand, and limit the amount of carbon emissions from "dirty" power stations.

BBC: Huhne unveils 'seismic shift' in energy policy