Is there a way of specifying a minimum scale for all the features of the atlas? (without using the fixed scale option) and for all scales above that "predefined scale (best fit)"? I want to have a minimum scale for the features in the atlas which are too zoomed in and best fit for any scales over that.
Having just figured it out, I thought I may benefit those of you who are having / will have the same issue as me in the future.
By selecting the scale settings in the composer to "predefined scale (best fit)", the system will automatically choose the best fit scale for each feature in that shapefile from a list of scales as defined in the project set up. This list can be accessed by:
Project > Project Properties > General > Scale properties. From here you will see a list of predefined scales. Add/Alter/Delete as required to acheive desired result. You can also specify your minimum/maximum and anything in between here. Simples.
Hope this helps!