Marks and Spencer shares have fallen by more than 20% after it warned a slide in consumer confidence had hit sales.
Underlying UK sales dropped 5.3% in the past three months with its food business - which focuses on top end goods - being badly hit.
The director of its food business is leaving the firm immediately as part of a management reshuffle.
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Growing concerns?
M&S said that general merchandise sales had lost ground - but were in-line with the downturn seen by competitors.
By 0830 BST, M&S shares were down 21%, or 68 pence, at 250p.
Seymour Pierce analyst Freddie George said that it was inevitable there would be worries about the firm's position.
He said that concerns will grow over "the strategy on food and the refurbishment programme, and the high debt levels of the group".
The High Street retailer had already expressed caution about consumer sentiment in May, when it said there had been a "mixed" start to its 2008/9 financial year.
But chairman Sir Stuart Rose said that since then, "consumer confidence levels have deteriorated markedly and market conditions have become more challenging".
But he added: "Four years ago, M&S was a weak business in a strong market. Today, we are a strong business in a weak market."
Challenging conditions
M&S said like-for-like sales - which strip out the impact of store openings and closures - were down 5.3% in the UK in the 13 weeks to 28 June.
Like-for-like food sales were down 4.5%, while general merchandise sales fell 6.2%.
M&S has become renowned for its "Simply Food" products - which are marketed as fresh and high quality but are more expensive than some other stores.
"Pressures on consumer spending and increased competitor pricing and promotional activity, coupled with changes in consumer buying patterns, have resulted in a significantly weaker performance," Sir Stuart said.
"In order to meet these challenging market conditions, we need to increase the pace of change on a number of operating and trading initiatives"
This means the director of food, Steven Esom, is stepping down immediately, and will be replaced by John Dixon, the boss of M&S Home and delivery business M&S Direct.
Last month, M&S gave a hint of the tough High Street environment, lowering the profits the firm has to make for directors to earn bonuses.
M&S profits for the year to the end of March 2009 are expected to be well below the Ј1bn recorded in the previous year.
(BBC)
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