PC Mick Wass, his rider during his time at the Met, said, "Chiswick has always liked to think he is the one in charge, but he has always looked after me."
Jeanette Allen, Chief Executive of The Horse Trust, said: "Chiswick is a real hero and it is a privilege to be able to provide him with a dignified retirement after spending a lifetime bravely serving the people of London."
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An inquest at Westminster Coroner's Court is examining the death of a man from Mitcham who died when his stairlift broke.
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Delays, diversions and cancellations caused chaos to services on South West Trains which were hit by signal failures in south west London.