The rose has been named 'Grantham's Thatcher Rose' and will be positioned in the civic area at the Guildhall next to the book of condolences. It will be replanted in Wyndham Park in the future.
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The 74-year-old was on vacation in Blackpool but is from the Midlands.
Oxygen levels are believed to have suddenly dropped, causing the fish to die.
John Preece is 75 and believed to be in the early stages of dementia.