Someone will correct me if I am wrong, but I am fairly certain the stores, if open, close early on the 24th and are closed the 25th as well as the 26th for Boxing Day. I remember there were friends who had difficulty obtaining milk because of the closures during the holidays.
I happen to come for 3 weeks last year beginning Christmas Eve.I wanted to start buying furniture for our home . Everything was closed! Including Supermarkets. We were fortunate to have a neighbor share milk.