Marks & Spencer has been unable to receive card payments in around a quarter of its stores today, due to a technical issue.
Drapers understands that the majority of stores are trading as normal but some have limited tills available for card payments.
It is not thought to be due to a security breach.
A spokesman for M&S said: “Some of our stores are currently experiencing technical difficulties with their tills and are unable to take card payments at this time. We are working hard to resolve this issue as quickly as possible and thank customers for their patience.”