The British company, which rejected three takeover offers from U.S. group Apollo in March, posted first-half underlying sales growth of 6% and adjusted operating profit up 22%.

"At least 100 million pounds ($122 million) of further efficiencies identified and to be delivered in 2023; accelerates our improved margin expectation to 2023 from 2025," it said.

($1 = 0.8212 pounds)

(Reporting by Kate Holton; editing by James Davey)