Glad you had a good time.
I can't comment on Asda, but I know when I do early morning food shops in Sainsburys or Marks, with deliveries in between, I feel quite safe, I guess you have to pick your times, it's always quiet when I go.
38 going and 28 coming back on your respective flights, wow! that sounds great, I almost regret cancelling our September flights now, thinking would we have been likely to be that lucky. For me it was always going to be about the palaver gathered together with many at the airport, coupled with the possible close proximity to others on board. All that, and when you arrive you still have to eat for how ever long the duration of the holiday is.
Will just keep fingers crossed and live in hopes for next year have now rebooked our flights.