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Last year's general election should have been an easy result to predict. There was a constant stream of opinion polls, many more than in previous campaigns. But they turned out to be highly misleading, suggesting a hung parliament. The actual result was a huge shock to the polling industry. In the second part of a series examining the role of opinion polling in British politics, David Cowling why the opinion polls got the last election result so badly wrong. He considers the analysis produced by the industry's inquiry into what went askew, and asks how easily if at all it can be put right in the future. Producer: Martin Rosenbaum.