Battered to death: a Falconer files short story

The third of a series of short stories covering the elapsed time between the books in The Falconer Files series.

This story covers events that occur between the books 'Pascal Passion' and 'Murder at the Manse'.

DI Falconer and DS Carmichael are both enjoying a well-earned rest day, when they are summoned to a most distressing incident that has occurred at a chip shop on the parade of shops in Upper Darley.
It was obviously murder, but was it something to do with the robust behaviour of some of the more aggressive customers from the night before or was it closer to home?