First of all, are you likely to see a horse outside Asda in Huyton - no (well not in this weather anyway - it would surely be inside Asda), Asda Aintree maybe, as they may have an aisle or two specifically for horse products.
Secondly, assuming there is a horse outside Asda Huyton and by some freak of nature it possessed a hand (and was prepared to shake said extremity) would it be logical to try and engage it in conversation - I think 'no' also.
Ergo, we are impelled to the conclusion that our intrepid consumer indeed encountered RY the man. Unless of course it was RY the hamster - a friend of mine has a hamster called Ron Yeats and as it happens it does shop at Asda in Huyton but not usually on a Friday.