In a statement, the bakery chain said it expects "the issue to be fully resolved shortly".

It added: "We apologise for the inconvenience this may have caused to our customers."

Earlier on Wednesday morning, Greggs said it was "working to resolve this as soon as possible" after issues prevented them from selling goods and resulted in shops being closed.

Users on X around the country reported that their local branches were shut or heavily affected, with some stores asking people to place mobile orders.

"Greggs in Westminster closed. Problem with tills," one person wrote, while another added: "Greggs this morning cash only! Sitting here with my coffee watching almost everyone have to walk out."

Another person said: "Heart goes out to all those with hangovers this morning who were unable to buy anything at Greggs."

It comes after "technical issues" affected Sainsbury's in store contactless payments and online delivery services at the weekend, causing chaos for shoppers.

Tesco cancelled some online orders too after suffering issues.

Last week, McDonald's customers were turned away from restaurants around the world, including in the UK, after the fast food chain was also hit by major IT problems.

Greggs operates more than 2,450 shops across the UK. It's unclear how many stores were affected.