I eat a lot of tuna, for no other reason than I love it. I like a fish finger butty but I don't think to buy them very often, definitely with red sauce and a splash of vinegar.
Fish finger sandwiches are on a few pub menus round here. I've never had one either. Mind you I'm not sure I've ever eaten a fish finger either. But I did used to like bread and butter with my fish and chips in the sit down chippie when I was a kid.