For what it's worth, the debate about whether the Marple Asda is or is not a 'large supermarket' can be settled by reference to the sizes that the supermarket business itself uses. To them, a large supermarket is one which is over 25,000 sq ft. The Marple Asda is 17,000 sq ft.
As anyone who reads the business pages knows, Asda and the other 'big four' supermarket chains are having a hard time at the moment, squeezed between the cheap discounters (Aldi, Lidl) and the upmarket food stores (M&S, Waitrose), plus the effect of their own online sales. Apparently we don't do huge trolley-loads of shopping once a week as much as we used to, so the biggest supermarkets are half empty!
So it makes perfect sense that Asda should have told admin they were relieved not to have moved on to the Hibbert Lane site.
As for the Marple Asda, I use it. but just for a few items, and I get out as quickly as I can! To be honest, it makes me think the Co-op wasn't so bad after all, though I agree it was expensive.