Tests At City
I recently did all of the tests at City as part of their ongoing research programme. This included tests that I had not seen before.
The most promising of all appeared to be, the oft quoted on here, PAPI test. As a green deficient I could do this and it is in my opinion the most practical of the tests that I have seen.
The researcher said that she was still analysing her data but had tested 120 subjects so far.
PM me if you want any more info.