The obvious answer would be to provide a service bell, as I proposed at the time. However, in British culture, that can come across as a touch aggressive and peremptory, rather like sounding a car horn. So surely the ideal solution, as one of my twitter followers has suggested, is to have a squeaky toy rubber duck on the bar. Friendly, humorous and completely non-confrontational.
@oldmudgie a small store in my town in Texas had a squeaky rubber duck mounted to the counter 😆— *Shannon*Sparkles* (@anImaginaryEcho) 26 May 2016