Thanks Tel - I did the City Uni tests a while ago, my diagnosis was "Moderate Protonamly". If I'm honest with myself I think its unlikely I could pass however it was done, based on the variations described above I think I'd still fail them all. The Beyne lantern was my last hope really, I found it easier than H-W but still failed. If you're borderline on colour vision they're all damn tricky.
I feel reasonably confident I could pass the FAA practical test, because I have no problems landing at night with PAPI's etc (not P1 obviously, Pu/t!)
Its a good idea to get someone else to write to Gatwick on test protocols - I might try that.
Good luck everyone still fighting this.