I am working on a project that focuses on Scotland. When I use the print composer to add a scalebar the scale is wrong. It shows 50 km for a distance that is probably around 200 km. Following the advice in this forum, I changed my project projection to a UTM one, in my case, UTM zone 30 WGS 84 which should be suitable for Scotland. The on the fly (OTF) box is ticked as well. But I still have the same issue with the scalebar. I would be very thankful for any suggestions.
I am using QGIS 2.8.3 Wien
Sorry I can not find the post I read early, but it suggested to switch the project projection to UTM to ensure that the scale works properly.