The feline diplomat, a rescue from Battersea Dogs and Cats Home, served four years in Whitehall before retiring in 2020.
After his initial retirement, Palmerston made a surprise return to public service in February 2025, taking on the role of 'feline relations consultant (semi-retired) to the new Governor of Bermuda'.
His death was announced on his X account, with tributes paid by Larry, the chief mouser at Number 10, and Labour MP Sarah Champion.
Palmerston's retirement in 2020 was attributed to his desire for a quieter life away from the limelight, having enjoyed 'working from home' during the coronavirus pandemic.
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