has been forced to stop selling some of its popular meal deal offers . The attack has now entered its third week and has caused significant stock availability issues across ' store estate.

This has caused the to pull some of its popular meal deal options from sale. One store at Victoria Station in has put up signs which read: "Due to availability issues, we are temporarily unable to fulfil this meal deal. Please bear with us while we work through this.”

The meal deals affected are its lunchtime offer, which includes a drink, sandwich or salad dish, and a snack such as crisp or fruit. These are often sold in the retailer's smaller outlets in train stations, airports, and petrol stations.

The dine-in meal deals - priced between £6 and £15 - offer various combinations of starters, mains, and desserts, and have also been paused. A spokesperson for M&S commented: “Customers can still buy meal deals in our rail station stores but there are pockets of limited availability for some items. We are working hard to continue getting our products into stores.”

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The cyber attack started over the Easter bank holiday weekend. Initially, customers reported problems with using contactless card payments and the Click and Collect service, and then on Friday last week, the retailer paused orders through its website and app.

Last week, confirmed that some of its stores faced "limited availability" on products due to the hack, which left some supermarket sites with empty shelves. Alongside this, M&S has also experienced issues with a "small proportion" of products it supplies to Ocado, which delivers M&S online orders and is part-owned by the retailer.

According to reports, M&S employees have been forced to move away from internal communication channels and are using personal messaging accounts to manage ongoing operations.

The attack has been linked to a gang of teenage hackers and is believed to be ransomware. This is a type of cyber attack that freezes systems until a ransom is paid. However, M&S has not yet confirmed the nature of the attack, nor the scale of the breach.

The cyber hack wiped more than £500million off M&S's stock market value last week, and the retailer is reportedly losing around £3.8million a day in lost sales for its online clothing and homeware ranges. According to its latest financial results, one third of M&S's clothing and household goods sales in the UK are through its online platforms and were worth around £1.2billion.

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