LHR
Tamworth undoubtedly. If you think it through, Airservices would be well advised toi equip Unicom with a non-compliant (i.e. cheap but OK) ADS-B IN receiver to provide "enhanced situational awareness".
There was an incident at Dubbo last week with an o/g (de-identified) and an i/b RPT where radio was lacking, see and be seen lacking, and when the o/g turned on his txpdr after Unicom alert to the RPT and a call from the RPT to the o/g - lo and behold the o/g turned up on the TCAS.
Totally disproves Dick's theory.
The other gap in Dick's theory is the probability versus the consequence. The probability is low but the consequence is high. But, we can ignore that can we not because "it has not happened". I guess most people who die in an accident have not been killed in one previously either
