I've just noticed that when I ECE a calendar event, in the results, the AUK ref is sometimes suffixed with an 'E' e.g. CB957099E. and if I look through the results list for that ride, you can see who ECE'd it by the 'E' at the end of the ref.
But, it appears that this isn't the case for every ride I've ECE'd, just some of them.
Why is the 'E' added? and why isn't it done consistently, i.e. just for some rides?