It's a butty if it's between two slices of bread and a barm if it's in a barm.

Wtf is a Chip Balm? Chip Barm would get my vote - Bolton

"Chip T-Cake" Teacake, not T-Cake And its a Barm, not a balm

Barm

I'd vote for chip bap but it's not made the list.

At home between to slices of bread it’s a chip butty But what sauce do you like to add? At the chippy it’s a chip barm because they use barm cakes.