What Is The Aintree Iron In The Song?

Question

What is the Aintree Iron in the song by Mike McCartney saying “Thank you very much for the Aintree Iron”.
Gary, Redhill

Answer

** Definitive **
Name: John, Aintree
Qualification: I heard it from the horse’s mouth
Answer: It’s a pub. I saw a TV programme where someone asked him what it was and that was his response.
(James O'Brien: I'll accept it, although someone has also emailed an interview with Mike McCartney, where he refused to give the answer to this question.)