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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Research into property prices has found London has more areas with an average price of more than £1m than anywhere else in the UK.
A permanent memorial will be unveiled today in memory of murdered Middleton soldier Lee Rigby.
The desk and chair where Charles Dickens sat to write his final novels have been bought for the nation using a national heritage grant.