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I've been doing a bit of research on the nature of consent in the context of GBH:
"Subject to any overriding public policy objections there is a two-limb test for consent: the person giving consent must be capable of giving it in terms of their age and mental state, and, it is given fully and freely with the knowledge of the actual level of force used or pain inflicted."
When she cut me, she didnt give me any knowledge of the actual level of force used or pain inflicted, she didnt even say where she was going to cut me, or even specifically ask if she could do it, she just ran a razor across my chest when she was on top of me. if im guilty, she is also guilty. But if she realises this and doesnt want to proceed, can / will the CPS continue with the prosecution anyway?