Diagnose this
-Gearbox whine at all times, but under load rather than off throttle. This has been constant and Dom tells me it was a feature of the car from day one
-Absolutely no slipping that I can feel regardless of revs or gear however.....
-After a brisk drive

the clutch judders when pulling away in first but this seems to go away when it has cooled down.
-The gear change is heavy and stiff going into first gear. This may be coincidental but I felt it was worth mentioning it.
-Oil for gearbox is brimmed and clean (as in very clean)
Sorry if this repeats the advice that I have sought from Russ via PM but I felt I hadn't provided all of the surrounding details
I should add that I am not
worried as such but if it all points to a clutch/gear box and diff change then I had better start planning ahead