fff
AIP ENR-1.6.2,
1.2 In airspace where the operation of transponders is not mandatory pilots of suitably equipped aircraft should comply with paragraph 2.2 [squawk 7000] except when remaining within an aerodrome traffic pattern below 3000 ft agl.
I think it is being amended, not sure whether it has come into force.
My understanding of TCAS, Mode C and Mode S is the same as Wrong Stuff's. I think we all should be using the term TCAS II in here, but that's just a nit-pick.