How to conceal your note taking in your local Tesco

So a blog piece from the Guardian came up in my 'most read' section on my Facebook app.  It's pretty old; but it tells the story of how one of the writers almost got arrested for writing down prices of items in his local Tescos, to be a smart consumer and compare the general grocery prices.  This bought on a rather disparaging vilification in his blog post, and we want to help in these times of need.  It seems as if it's become restricted to take notes in a Tesco, here's some forms of concealment.