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Official figures on rates of problem gambling in Britain - which have been put as low as 0.3% - can mask" the scale of harms by including people who never bet, a report published by the industry regulator has warned.

Various surveys suggest a problem gambling rate in Britain in a range of between 0.3% to 2.5%. But in the new report that figure rose sharply when non-gamblers were excluded - and was even higher among those who gambled on online casinos.