High street baker Greggs is to experiment with earlier and later opening hours at some of its stores to cater for changing shopping habits and shore up falling profits.

The 1,336-store UK chain said it would trial different opening times to satisfy local demand for food-to-go throughout the day.

The group is planning to open 20-25 new stores this year and accelerate the pace of refurbishments, said Sir Michael Darrington, MD. It also plans to launch a premium range later in the year and more indulgent lines.

This week Greggs reported a 12.8% fall in full-year pre-tax profit to £40.2m on sales up 3.3% at £551m.