Hi Mark, & welcome to the forum.
I had something similar on one 7. The clutch was not fully
disengaging. I could not get it to come out of a couple of gears
when stationary. I would get a clash of gears, if I tried to put it
into those gears, when the car was stationary.
It turned out to be the spring diaphragm was loose in the cast iron
part of the pressure plate, & not moving it far enough to give full
disengagement of the clutch plate.
There was no noise, or other symptom, with the thing in the car, but
with the pressure plate out, in your hands, it rattled when you
shook it.
Not the answer you might like, but the best I can do. Hope you find
another cause, perhaps air in the slave cylinder.
Hasbeen