Ralph (karabiner) mentioned the MGM salt beef sarnies too, but I've never had the pleasure, don't even know what it is, so I asked google....
Corned beef is salt-cured beef brisket, traditionally made with large-grained salt ("corns") and spices, giving it a distinct flavor and pink color. It's often cooked low and slow with vegetables like cabbage, potatoes, and carrots
Cabbage & carrots? You gotta be kidding me.
When i was a young lad we occasionally travelled to London as a family to visit the tourist attractions.
If we were in the vicinity of Soho we would purchase Salt Beef sandwiches-two doorstops of freshly baked bread,a generous layer of mustard and a filling of melt in the mouth Salt Beef.Delicious.
Nowadays i regularly make my own,good Silverside of Beef put into a large tub with a solution of spices,Brine and Saltpetre and left for two weeks.
When ready it is boiled and then then served with mashed potatoes and pickles.
It remains a family favourite to this day.