7 Best Sandwich Fillings Send in your favourite Fillings and we will post our top picks on our Instagram, Facebook and Twitter. firstname.lastname@example.org 1 Tuna & Sweetcorn with Mayo Got to be one of the UK’s favourite sandwiches. Simple combo. Meaty, sweet and crunchy. 2 BLT Starts off healthy with lettuce and tomato before ending with delicious salty bacon. Apparently the UK's favourite sandwich dating back to the early 1900s. With our Suffolk bacon it's hard to ignore. 3 Egg & Cress or Salad Breakfast & brunch veggie classic. 4 Roast Beef & Horseradish Britain's version of a burger. 5 Cajun Chicken If you like things spicy, then the Grilled Cajun Chicken Sandwich is the answer. Deliciously spicy and crispy. 6 Coronation Chicken The UK & India coming together to make pretty much a curry sandwich. This retro 50s favourite is still up there. 7 Avo Lettuce, avocado & mustard. We had to have something super healthy and tasty.