Traditionally, those pancakes (called oatcake locally) were potter's portable lunch to take to work from home. In closed form this can be warmed on a top of kiln or stove without spilling the filling. You can still find small eateries in Stoke-on-Trent town with a sign board "Oatcake". I had a ham and cheese oatcake in a pottery museum. Love the napkin holder.
