I know nothing of defence procurement but as a layman I would be surprised if we got TCAS on an aircraft that supposedly has only 5(ish) years left.
I can see your thinking Davey Boy, and this is certainly the way the IPT will think, but the installation of TCAS has to be considered not just from the point of one platform, but from the wider perspective. You cannot make a decision not to fit TCAS, a proven safety system, just by considering the risks to the Nimrod fleet, by definition, it takes two aircraft to have a mid-air.
Rudekid, this was not just an IPT decision, the decision not to fit TCAS/GPWS and other such systems has been made much higher than IPTL level. The installation of these has been recommended in numerous accident and incident reports. Safety has not been the driving factor in the limited installations so far, it has been forced only be the need to use certain parts of the airspace. The MoD spokesmen who constantly trot out the mantra of safety being a priority are nothing much more than l.... !
S_H