A seven-year-old boy who died after falling ill during the floods in February suffered carbon monoxide poisoning. Zane Gbangbola and his parents became ill at the family home in Chertsey in Surrey and were taken to hospital, where he later died.
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Police are investigating whether a Land Rover Defender found burnt out in West Horsley was involved in Tuesday night's ram raid.
The work, called Gift Horse, replaces the giant blue cockerel that previously sat on the plinth.
50 of the country's worst pollution blackspots are in the capital. Many in places you may visit every day.