Marco, you obviously don't like the 'high conspicuity colour scheme', thats fine, but remember the matt black effect is the only one to come out of anything that was remotely like a scientific study. A straw poll of a number of pilots in some dark and dusty crewroom is certainly not a valid reason to discount the adoption of a yellow and black colour scheme (even though most of these are a b**tardization of the recommended colour scheme. That Police forces that operate over congested areas 'slavishly' adopt the same scheme is no surprise, there is no barrier that prevents them from going over the grass stuff during the normal course of events.
The fitting of TCAS to all police helicopters will certainly come but for the moment there is a limit, imposed by the CAA on the number of police aircraft that can have TCAS fitted, due to the very real problem of 'transponder saturation' (my phrase but I think it fits the bill!)
Finally, the choice of colour is a subjective thing but it looks a bit sexier than some crappy old jam sandwich style