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It's not shown in that picture. It's on the bottom I think, near the pulley end and is 10mm as you say with a piece of metal perhaps 10mm squared with a slight lip trapped under it.
 

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The way it works is the setscrew [10mm AF] is loosened & the plate is removed. This allows the screw to go in further & tighten against a dia. of some sort inside the pump, locking it from turning. To unlock, the screw is loosened, the plate reinstalled & the screw retightened. The only purpose for the locking plate is to keep the screw with the pump during normal running.
 

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Look in the tech section (DIY cambelt change) post 38 shows Autodata pic of the pump. Number 16 bolt & 17 lock plate T:
 
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