Speaking as the chain announced its full-year results, McDonald's UK CEO Paul Pomroy said the company had delivered "strong growth" during a "tough time" for the sector.
McDonald’s global sales rose 5.9% in 2019, though consolidated revenues were relatively flat at $21.1bn (£16.2bn).
The company opened 40 sites in the UK and Ireland last year and served 1.1bn customers.
Pomroy said the chain will invest £1bn in the region over the next three years, focusing on restaurant refurbishments and improving the “digital experience” for customers.
The company began trialling a new grab and go format, with no seating and smaller self-order screens, on London's Fleet Street last summer.
McDonald’s said its delivery partnership with UberEats accounted for more than 10% of sales in 2019. The chain will also begin working with JustEat this year to help "meet demand".
“Rising food prices, labour costs and inflation, coupled with wavering consumer confidence have resulted in a tough trading period across the board, and we are mindful of that," said Pomroy.
“While we undoubtedly live in challenging times, I am confident for the year ahead.”
McDonald’s has approximately 1,300 restaurants in the UK and over 36,000 worldwide.