Mark Watson, who represented Tesco in court said the company had invested in "procedures and systems" to correct the problems and insisted the problem was with local management.
A shopper first noticed a mouse in the store in March last year, and reported it to Westminster Council.
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41-year-old Latvian Arnis Zalkalns was last seen at home in Ealing on Wednesday, 3 September. He was reported missing two days later.
He fell 30 feet to the floor. But despite the drama, it appeared the show must go on.
To some, it seemed like really poor taste. But to other hungry customers it seemed like a good way of spending £50.