Tim Martin shared that the pub chain's tax bill is set to jump by two-thirds next year after Labour's Budget hiked the National Insurance tax for businesses in the UK

Tim Martin, chairman of Wetherspoon, has warned customers of price rises

M&S and Sainsbury's, which both report results this week, are expected to face a combined £200m hit to their tax bills after Rachel Reeves unveiled sweeping changes to employers' national insurance, Sky News understands.