Thanks for the input. I've actually just realised as a result of your post that my printer is actually an UM2 externded and not the UM2+ Extended as I had configured in Cura. Would that make a difference in this case? I notice if I select the correct printer that the total print time increases significantly, but settings look the same, so I guess the printed choice is limiting the speeds somewhere. I shall kick off another print with the correct printer and report results.
Printer came with the Olsen block from the factory (fitted myself). The nozzle is definitely 0.8mm in both settings and reality.
I am fastidious about cleaning the glass printer bed. It gets wiped down with isopropyl alcohol before every print until it is squeaky clean. I've never had issues with adhesion. Though having said that, the print in the photo above did have an issue on the supporting arm labelled "minor pitting" above where it lifted from the print bed, but this must have happened after that part of the model had finished printing as the top layers are fine and external quality looks good. I took those photos above half way through a print. I've adjusted the bed slightly to allow a thicker first layer for the brim as it looked a bit thin in places. I shall see if that makes a difference for adhesion.
The filament is ColorFabb PLA 2.85mm. Printer settings are Flow 100%, Extruder 210C, Bed 60C, Fan 100%. I do not seem to be able to see / change material settings in Cura though. Material temperature settings are hidden due to the setting in "Enable Nozzle Temperature Control", but this setting is non existent despite looking and searching. How do I change this?
Attached is another screenshot with more settings, plus the Cura project which i hope contains everything(?).