I think the 'glamorous garb' bit lends itself far more to Aintree than it does to Haydock. Try putting 'Aintree fashion' into Google and then doing the same for 'Haydock fashion'. There's a big difference in the results!
Further, the names of the two racecourses are 'Aintree' and 'Haydock Park', so the latter would have to be (7,4) if the setter was being accurate anyway.
I agree with Buenchico, someone born in Liverpool is a Liverpudlian, a Scouser and a Lancastrian - Lancashire play a couple of first class cricket matches at Aigburth, Liverpool every season.