The bookmaker warned that the curbs on FOBTs, which the government described as a “social blight”, would reduce its high street revenues by up to 45%, rendering 38% of its shops unprofitable.
It predicted costs of up to £60,000 per shop closure, or more than £50m, with operating profits likely to decrease by up to £100m a year. Each bookmaker employs about five staff, meaning about 4,500 jobs are at risk if 900 shops close.
The gloomy prognosis sent shares in the bookmaker sliding, closing down more than 8% at 287p, the biggest faller on the FTSE 350 on Friday.
But William Hill said it had been encouraged by its nascent US operation, which has been growing fast since the supreme court overturned a longstanding ban on sports betting earlier this year.
With William Hill’s UK network of high street bookmakers set to shrink, its chief executive, Philip Bowcock, said the company’s US operation could surpass its domestic business. “In time, yes, depending on regulation, our US business could be bigger than the UK,” he said. “The US population is seven times that of the UK and they like to gamble more, I think. Gambling is seen as part of everyday life, you’re not a social pariah if you enjoy it.”