April 8 (Reuters) – Britain’s FTSE 100 index is seen opening down 9 points at 7,438 on Monday, according to financial bookmakers. * DEBENHAMS: Mike Ashley’s Sports Direct launched an attack on Debenhams top executives, accusing them of a “sustained programme of falsehoods”. Sports Direct has called for trading in Debenhams shares to be suspended, for two board members to undergo lie detector tests, and asked for industry regulators to investigate how the company is being run. on.ft.com/2uQguAC * SHELL: China’s Sinopec Corp has agreed with Royal Dutch Shell to jointly study a shale oil block in east China’s Shengli oilfield, the Chinese state oil and gas major said on Monday. * Britain proposed new online safety laws on Monday that would slap penalties