LONDON - British finance minister Rishi Sunak will warn on Wednesday that fixing the rising cost of living for families will not be easy, in a speech to business leaders urging them to boost investment, staff training and innovation.

"Our role in government is to cut costs for families. I cannot pretend this will be easy," Sunak will say, according to extracts of his speech released in advance.

"There is no measure any government could take, no law we could pass, that can make these global forces disappear overnight. The next few months will be tough."

(Reporting by William James, Editing by Kylie MacLellan)