Dave Lewis, its new chief executive, has been in charge for a little over three months, but has already had to deal with a high-profile accounting scandal and profit warnings. He is expected to announce job cuts, office closures and a change to its relationships with suppliers.
Some of its problems are far from unique. Marks & Spencer (M&S), also reporting Christmas trading on Thursday, J. Sainsbury, reporting on Wednesday, Morrisons and Asda, which is part of WalMart, share a number of issues which are plaguing the U.K. retail landscape.
Tesco's like-for-like sales, excluding petrol, are expected to be around 3.5 percent lower over the Christmas period than in the previous year, with Sainsbury's down 3.8 percent, according to Pradeep Pratti, analyst at Citi.
While M&S food sales are forecast to have risen slightly, sales of clothing at the retailer are expected to drag overall sales figures down.
Here, we take a look at some of the key problems facing the best-known facades on the U.K. supermarket landscape.
A big weekly shop to an out-of-town location seems to have been replaced by a series of smaller trips to nearby supermarkets. This puts Tesco, famed for its behemoth hypermarkets, at a disadvantage.
M&S, which has historically been a shop where people top up their main weekly groceries, hopes to benefit from this trend.
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