Right, got it back, about £450 of parts fitted and there is a difference. 4th to 6th feels very slick, the best in the box now. However, when cold, going into 2nd at any speed is an effort. Once warm the best way to describe it is a lot tighter on the whole. Not notchy, but tighter.
If anyone's interested, I got the dealer to give me copies of all the assembly diagrams for the box, several pages worth.... I'm working on getting copies of the service notes too.....