BP lifted the oil sector after saying that it yesterday succeeded in stopping the flow of oil pouring into the Gulf of Mexico for the first time in three months. The shutdown is part of an "integrity test" to see if the leaking wellhead can finally be contained. The test started last night and will last at least 6 hours and could last up to 48 hours. It is expected that no oil will be released into the ocean during the test.But banks fell back after US peer Bank of America disappointed the market despite reporting a much smaller than expected fall in second quarter profit to $3.1bn. Barclays and Lloyds Banking were among the heaviest fallers in the UK.Top performing sectors so far todayElectronic & Electrical Equipment 2,064.65 +1.27%Personal Goods 13,948.21 +0.90%Aerospace and Defence 3,142.10 +0.09%Oil & Gas Producers 6,982.64 +0.02%Beverages 8,575.34 +0.01%Bottom performing sectors so far todayBanks 4,612.03 -3.10%Life Insurance 3,466.95 -1.73%Industrial Metals & Mining 5,420.03 -1.72%Technology Hardware & Equipment 485.83 -1.60%Financial Services 4,717.26 -1.55%