Paul O'Grady has thanked the nursing staff and wellwishers after he was admitted to hospital after feeling unwell.
O'Grady said, "I am feeling much better - I would like to thank all the nursing staff for their kindness and everyone who has texted or phoned in wishing me well."
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A man who met PC Keith Palmer said his murder "sent a shiver down my spine".
A search is underway for two brothers, aged 1 and 2, who were in their babysitter's car when it was stolen in California.
Officers said the girls were approached during separate incidents earlier this week in south London - possibly by the same suspect.