Second British energy supplier ceases trading in a week

LONDON (Reuters) - A small British energy supplier, called Spark Energy Supply Limited, has ceased to trade, regulator Ofgem said on Friday, promising to find a new supplier for customers soon.A number of other small energy providers have gone bust in Britain, prompting Ofgem on Wednesday to propose financial and customer stress tests for energy suppliers wanting to enter the market.On Friday it said the outstanding credit balances of Spark Energy's 290,000 customers would be protected and there..