Sainsbury's chief executive Justin King has told ITV News that the chain's popular toys range is "new competition" for businesses like Mothercare, whose shares fell 30% today.
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Jessica Urbano Ramirez was two weeks from her 13th birthday when she was killed.
The Labour leader made the plea in an address to business leaders in Londonderry.
They are being urged to ensure they have had the MMR jab ahead of The Biggest Weekend in the Midlands.