All right, here is the gospel:
Patties. Today who knows but in the 1960s and 70s I used to make them in my parents' chip shop on Newland Ave. They were made with boiled potato that was then mixed with sage and onion stuffing and put through a mincer. They were then filled into a pattie mold and smoothed off with a knife before being pushed out of the mold onto a tray - 20 patties per tray. They were then battered and fried in dripping. My dad wouldn't hear of oil.
The fishy bit: sometimes, if there were any scraps if fish left over, they went into the mince as well.
Make what you will of it all. That's how it was. I had one every time we opened. They were cheap and tasty.
I don't know if people make them by hand now.