No, cancel the pickle.
Slice a tasty tomato, and put a layer on. Perhaps a thin layer of salad leaves as well. Replace the butter with mayonnaise, on both slices.
Lovely!
I spread various chutneys, mayonaise or mustards on my bread instead of butter. For cheese and tom i would probably go for the caramalised onion or the mayo, i'll use a tomato chutney if i have no toms, for ham and tom i'll either use English mustard or plum chutney. I also do the same when having bread with my meals.
come on barry lighten up! I do the same as you, butter (NOT marge) both slices, cheese on one side, pickle on t'other and whack em together and stuff in boat race, magic! I do that because you can spread the pickle more evenly on the bread rather than the cheese.