BP, the worst oil investment this year on Wall Street, is finding its backers in the City of London. Investors piled more money behind 'buy' trades than 'sell' ones in London since the April 20 rig explosion, according to so-called money flow data compiled by Bloomberg, even as the stock slumped to a 13-year low. By contrast, BP's American depositary receipts have recorded a net $185 million outflow in New York, the data show. As the worst oil spill in U.S. history spurs attacks from President Barack Obama and soils Florida's beaches and the Louisiana marshlands, London investors are backing BP's embattled chief executive officer, Tony Hayward. After a five- year string of accidents and deadly disasters at BP facilities, Rep. Bart Stupak, d-Mich., suggested last week its safety record could justify pulling the company's operating permits in the United States. 'There's a feeling in the U.K. that BP has been singled out unfairly and that there's long-term value in the stock,' said Iain Armstrong, an analyst at Brewin Dolphin, which oversees more than $31 billion in London and increased its BP holdings in May. 'In the U.S., it's a very emotive issue, and politicians are making it much more personal and vindictive. If you're a U.S. fund manager and BP doesn't manage to stop the leak, you've got a lot to answer for.' Hayward drew criticism again this weekend after attending a yacht race off the south coast of England, watching sailboats on the Solent at a time when fishing in the Gulf of Mexico is curtailed because of BP's spill. Hayward's attendance was 'part of a long line of PR gaffes and mistakes,' White House Chief of Staff Rahm Emanuel said on ABC's 'This Week' television program. 'We can all conclude that Tony Hayward is not going to have a second career in PR consulting.' BP agreed last week to cancel nine months of dividend payments, saving about $7.5 billion, sell $10 billion of assets and reduce investment to raise cash to meet Obama's demand for a $20 billion fund for victims of the spill. 'When people turn on the news they see this gusher pouring out,' said Ronald Sorenson, CEO of W.H. Reaves & Co. in Jersey City, N.J., which manages $1.6 billion in assets, including BP shares. 'That puts a lot of pressure on advisers. Individual investors take this very personally.' Sorenson said he's sold shares for individual investors since the spill began. The London-listed stock is down 47 percent since the explosion on the Deepwater Horizon rig that killed 11 workers and started the leak on the seabed. The shares fell to a 13-year low on June 15, wiping about $89 billion off the company's value. Money flow attempts to measure the capital moving in and out of a security by adding the value of higher, or uptick, trades and subtracting the value of downticks. As prices fall, money flows are usually negative, turning positive as prices rise. A divergence between money flow and price may signal a change in the trend. 'People in the U.K. are buying the stock, taking advantage of the discount' since the stock plunged, said Cleve Rueckert, an equity analyst at Birinyi's firm. 'But when a stock starts to slide like this, it's hard to say when it will turn around.' With assistance from Andrea Catherwood and Alexis Xydias in London and Deirdre Bolton and Jim Polson in New York. 