A leak off?? are you sure that's the right process here?
Never seen P0201 flagged before due to internal leak?
A relative compression would be a good start, and as Chris says, injector resistance on the offending Cylinder, use the scope for voltage and current, You could always swap injectors over or use jump wires to check injector and wiring... And as its a Corsa D, make sure the ECU is not swimming had this last month after garage fitted an injector...
Darren
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