Any parents worried about their children's school food is asked to call Westminster City Council's advice line, which is open from 8am tomorrow.
The number is 020 7745 6401
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The 47-year-old man died shortly after 3pm on Tuesday.
Specialist explosive detection dogs searched through the town examining letter boxes and phone booths for signs of potential devices.
Temperatures reached 29.1C in St James's Park, central London.