If it was my car I would have wanted them to notify me before doing any work, especially with the clutch, because how would they know what I would want it replaced with? For instance I don't want a standard clutch replacement I want a paddle clutch or RS clutch when the clutch goes on my focus, and possibley a different flywheel, so that would require more work to remove a new standard clutch.
I took my car in for a service, they rang saying my brakes need doing very soon (£120), I did them myself for £60, I'd be well anoyed if they just did them.