I find a really nice trick is to grill one side of both slices of white bread.
Assemble the sandwich with the toasted side facing out.
You get the crunch of toast followed by the soft white bread that has soaked up the butter and bacon flavours.
Lovely stuff.
Streaky, cooked crispy. White bread, one side of each slice toasted. This gives you integrity and crunch because the toasted side is facing out and then you hit the soft untoasted side mingling with bacon grease and Henderson's Relish and then the crispy crunch of the bacon. So, toast one side...