Delbourt, okay, we were driving across Dartmoor when my wife suddenly found it impossible to select , 1st, 3rd, and 5th gears but 2nd, 4th and rev not easy but doable whether the engine was running or not, due to the rain I did not investigate until we were at home. The following morning with my wife moving the gearlever I could see that the cable that runs underneath the gearbox was free to move in its support bracket due to the horse shoe clip being missing, You will have exactly the same arrangement even if like me you have the Mike Satur bell crank like I have. Having obtained and fitted another clip the gearchange was now perfect with the engine off but still baulking when the engine was running. Like a lot of other owners I has always needed the pedal pushing right down to get the clutch to disengage but now it wasn't disengaging at all. The next step was to bleed the clutch which just enabled me to change gear with the engine running. I decided to order and fit a master cylinder seal repair kit, this was fitted yesterday and there is still no change. You are quite correct that replacing the clip should have reinstated it to as before but when that failed to materialise the obvious next step was bleeding the clutch. Yes I can see the slave cylinder both the pushrod moving and the bracket flexing. 
Having thought about it overnight I am now inclined to think that like Pharg55 suggested the fault lies with the clutch/release bearing. I wonder if the release bearing did fail while driving then the increased pressure when changing gear caused the clip to break or fall off?

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