Suckback 6 - Well well, obviously your aircraft is in this scheme?
The straw poll of a number of pilots in some dark and dusty crewroom is not correct. This opinion came from CFS(H) instructors during a deconfliction seminar hosted by BHAB at Shawbury.
Had you read AIC 135 (Yellow 353 dated 2 Dec 99) you would see there is no limit to the amount of TCAS 1 that can be fitted to helicopters. You are correct however when you state "transponder saturation". IFF/SSR policy on a TCAS licence states 'you shall not operate TCAS 1 if >3 similarly equipped aircraft are active within a zone radius of 5 nm'. Could be interesting at Silverstone??
Finally, if you want your police helicopter to be aligned to the military you may well find that you pick up some of their flack as well. Its up to what you want the public perception of your aircraft to be. I might add I wouldn't want a battenburg colour scheme though!!