Hi Shy
I don't think it has ever been revealed what the term meant, although there was a lot of speculation. Roger McGough in his autobiograph, Said and Done, mentioned that one suggestion was that it referred to Beatles manager and entrepreneur Brian Epstein -- "Aintree Iron" designating horseshoe and "hoof" being rhyming slang for "poof." That explanation seems a stretch to me though!
All the best
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Chris
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