No offense taken.  I'm happy to have my edits challenged.

In this case, I was wrong.  In addition to the sandwiches, there is actually a Greggs inside.  It's just that the only entrance is hidden behind the alcohol aisle at the very end of the shop.  As in, the Greggs is where the sign for it is, but to go inside, you have to first go around the whole building, then go inside and cross the entire Asda.

Added the Greggs with a note that it's weird to access.