Tesco's decision to rebrand itself 'Britain's biggest discounter' has had no effect on fast-growing German chain Aldi, which enjoyed its strongest ever sales week last month.

The boast comes as industry figures suggest market leader Tesco is proving to be the most vulnerable to rapidly expanding discounters Aldi and Lidl as shoppers seek out cheaper groceries.

'We have not seen any difference. In fact, last month we had our strongest week on record [week beginning 29 September],' said Aldi director Graham Hetherington. 'The majority of our growth is coming from the big four supermarkets, particularly Tesco.'
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