I"ve been using a PAH whistle, which is a pain in the harris thanks to the fact that the pitch changes if the barrel twists, an it's on a stupid metal chain which is FREEZING on my neck.
Dog (Doodle 7mnths), has started ignoring it anyhow, so I'm going to begin Project Infallible Recall (feel free to laugh here...) using liver and a brand new shiney whistle.
Which one do I get? I started asking advice in our local chandlery and got surrounded by a baying mob of men with flat caps and very strong opinions shouting numbers at me.... 