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Profits at Tesco have jumped 28% in what the UK's biggest supermarket chain described as an "uncertain" market.

Chief executive Dave Lewis said the group was on track to meet the "vast majority" of the turnaround goals he set when he was appointed four years ago after an accounting scandal.

The group said its performance was "strong", and Tesco has almost doubled its dividend.

Full-year pre-tax profits were £1.7bn, with UK same store sales up 1.7%.

"After four years we have met, or are about to meet, the vast majority of our turnaround goals. I'm very confident that we will complete the journey in 2019/2020," said Mr Lewis, who oversaw the takeover of wholesaler Booker in 2017.

"I'm delighted with the broad-based improvement across the business," he said.

Jobs have been lost as he aims to save £1.5bn a year and up to 9,000 roles were put at risk in January when the chain announced it would close food counters in 90 stores.