I rarely eat supermarket sandwiches, Uxbridge has a couple of very good sandwich shops in Scoffs and Pumpernickels who will custom build you the sandwich of your choice. However today I went into Marks’ in search of a change and found there smoked mackerel bloomer sandwich with crispy lettuce and a horseradish dressing. It’s perhaps the best sandwich I’ve ever bought. Lovely, soft, poppy-seed bread. A dressing with both horseradish *and* mustard, but neither are overpowering. And then the big fat flakes of smoked mackerel. Blooming marvellous.