BP climbs 3.9%; Standard Chartered slumps 6.7% ReutersCustomers shop at a Primark store on Oxford Street in London.The U.K.’s FTSE 100 index scored its second daily gain in a row on Tuesday, as advances for oil companies outweighed a slide for home builders following ratings downgrades. The benchmark index UKX, -0.49% added 0.3% to close at 6,383.61 after seesawing earlier in the session. The British blue-chips index on Monday finished slightly higher as a solid U.K. factory-activity report partly offset a weak manufacturing data from China. Energy companies were among top performers on Tuesday, with BG GroupBG., -1.65% up 2.7% after Royal Dutch Shell RDSB, -2.38% RDS.B, -0.49% said it expected benefits from its planned $70 billion takeover of BG to be 40% higher than previously announced. Shell shares tacked on 2.9%. BP PLC BP., -3.00% BP, -0.74% rose 3.9%, boosted from a solid rebound in oil prices CLZ5, +0.39% At the bottom of the FTSE 100 was Standard Chartered PLC STAN, -3.29% Shares slumped 6.7% after the Asia-focused bank outlined a major overhaul of its operations that involves raising capital, cutting jobs and costs and exiting from certain businesses, among other moves. Standard Chartered plans to raise $5.1 billion in a rights issue to shore up its balance sheet. Shares of Barratt Developments PLC BDEV, +1.22% Taylor Wimpey PLCTW., +0.72% Persimmon PLC PSN, +1.18% each fell after Liberum cut its ratings on the home builders to sell from hold. Barratt fell 3.9%, Taylor Wimpey lost 5.3% and Persimmon gave up 2.4%. The companies’ “valuations are too optimistic to withstand the gross margin pressure that we expect in the coming years as house price inflation is suppressed by a more vigilant regulator and build cost inflation returns,” wrote Charlie Campbell, investment analyst at Liberum, in a note. Meanwhile, fiscal-year pretax profit at Associated British Foods PLC ABF, +0.64%the parent company of apparel retailer Primark, fell about 30% to 717 million pounds ($1.11 billion). The decline stemmed from strength in the pound against other currencies as well as a tough year for the company’s sugar business. Shares of AB Foods ended with a tiny gain. More from MarketWatch