If I only liked tea. . .

I came across this British Wal-Martish website today. Isn't their little ad just too cute? Look how they say "mum" and "Whilst stocks last." Don't they know it's "While supplies last"? Silly British people. Also - what is up with a Mother's Day advertisement in February? Do they celebrate that holiday at a different time than we do? Can anyone explain this to me?