My late grandmother used to bake these for me in old Fray Bentos tins, to keep me sustained whilst thumbing back to the lake district from Blackpool in the early eighties.
In Lancashire they are known as ‘whistlers’, this name comes from the war years when meat was scarce. Meat and potato pies, a great Lancastrian tradition, suddenly had to be made with little or no meat at all.
If you had a pie you had to whistle if you came across a piece of meat, as the war went on, my mother said there was not a lot of whistling at the dinner table.
Only possible addition was a little cooked pig liver, bacon pieces or pig kidney.