As Rod The Mod once sang 'the first cut is the deepest' - well it certainly was in this case!
I took a bit too much off on the first attempt, you can just see on this photo where the centre of the end mill has been ground.

A quick test cut and it was quite clear from the pattern that a lot of rubbing was happening.
But, its certainly a good start and I never expected it to get it right first time, so, progress...of a kind!
Nick