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The front vertical hub does not have a cir-clip. There is a cir-clip on the front axle and it is located on the end of the shaft in the gearbox. It can be purchased separately. Take a look at SNG Barratt's website and look at the front axle information. Not knowing what other work has been done I can't imagine that one missing but I suppose it is possible.
When the rotor damage is observed is the wheel bearing being pushed out of position. The vertical link only has a washer and nut holding the hub to the axle.
Attached is the picture breakdowns of the vertical hub and the axle. I still think the bearing is simply a pressed in fit and doesn't have a cir-clip. If it has one the parts book doesn't show it. You can try a direct call to SNG Barratt and maybe they can help you further.
Missing that clip you showed me ( C2S47024) is what is making my wheel bearing to slip out and push my rotor enough to be eaten by the breaking system?