While we were with him, Chris Martin very kindly offered to prepare our own personalised sandwich chart.
We filled in a form on behalf of Mrs Edna Womble (deceased) of 42 The Mews, Cardiff, from which Chris produced this...
As you can see from this illustration, onions are in the ascendant and there is a favourable conjunction between mustard and fishpaste.
Based on this information, Chris forecasts an emphasis on dairy products over the next seven days, with a brief flirtation with Pot Noodle midweek, and rounding off with strawberry yoghurt on Friday.
He also mentioned something about beetroot, but by that time we had given up.