And coming up in Sportsday On Bbc News. The worlds greatest sprinter prepares for his final bow. Well hearfrom usain bolts pre World Championships Press Conference at half past six. Good evening and welcome to the bbc news at six. Over Three Million british gas customers face a hefty rise in their electricity bills. The company argues that its own costs have risen and from september it will charge 12. 5 more for electricity. So what does that mean . Well, a typical household on a dualfuel tariff will see its annual bill go up by £76. Its the first increase from british gas for nearly four years but that hasnt stopped Consumer Groups and the government condemning the move. Our business editor, simonjack, reports. Electricity, a basic need, a simple product. The same wherever all whoever you buy it from. If you buy from british gas it will be 12. 5 more expensive from september as the u k. s largest more expensive from september as the u k. s largest supplier, more expensive from septem