Ford Focus Sport 1.6TDCi. New clutch assembly has left the car with very notchy gear selection

Take it wasn't a Ford dealership who replaced the clutch ?

No, it wasn't - unfortunately, or stupidly - I went for a cheaper quote (False economy I guess) - alway's used dealership in the past but this time the price was prohibitive.

When you use independent garages , in many cases they may use parts that give them more profit as opposed to quality . I have also seen problems occur when engine is left to hang unsupported when gearbox removed and causing damage with gear linkage or cables . Not saying this happened or not with your car , not in any position to do so from here . As for gear oil too thin , usually if it's too thick you get problems . I know what you mean , but the cheaper option is not often the best in the long run .

I suspect that's what they have done - used inferior quality components. I suppose this should be a lesson learned for me.