Thanks very much, gemnbowcup - really useful data point. I am aware of the FB group but I'm currently not using FB so it's hard to look up the group for info unfortunately, therefore much appreciated.
I'm currently holding a booking on EK (which I'm generally happy to stick to), but wanted to consider switching to EY to save on the EK miles which I may need later on, hence needing some clarity on how this works.