So, still the same poor work with databases from Garmin re. filling stations and convenience stores. However, I bought a Montana 600 with OS 1:50000 maps.
It's been fun picking out routes in Basecamp with a 'proper' map!
Delving into the Menu options reveals Fuel Services. Yes! Petrol Stations without the shops. So they have the knowledge, but I'd have thought that given that the Zumo is primarily for bike use and the Montana primarily for hand held use...
So plus points for the person or team that set up the Montana software but demerits for the Zumo lot.
Still awaiting an email from them about how anyone should deal with the European maps on the Zumo as the helpful box prompts one to choose a smaller area or buy an SD card. No advice what to do when an SD card is inside it...