Day revolves around a sandwich

Well a small part of a day maybe. There's an M&S brown bread cheese and ham sandwich sitting in the fridge.  It was bought in Aberdeen yesterday and has made the long journey down here relatively unscathed, now it's just chilling, waiting. I'm also considering adding some pickle and salad to it before consumption, that's an obvious game changer. It'll be bigger, fatter, tastier as a result but not as the M&S sandwich designer intended it to be. I may miss something because of this, it's the possibility of the bad science of unintended consequences in sandwich consumption coming together in a light lunch setting and ending badly. Of course as there two sandwiches in the pack so I could modify one and not the other or add the salad etc. to one and then mayo and tomato to the other. Then there's the mustard, when do I bring that in? I have a fresh and unopened jar I bought in Aldi for 59p last Friday. The day that I accidentally visited four different supermarkets in the space of two hours in the most unplanned and uncoordinated burst of shopping I've recently experienced. It was mainly down to me not having a decent list to begin with. So back to the sandwich... more thinking time is required.