Apologies for the thread drift, but mention of the Herons takes me back to my ATCO training. Was tasked with doing a live 1/2 mile SRA. On the debrief my (autocratic) instructor picked me up on some supplementary phraseology that I used and which he took exception to. I asked the aircraft if he was a Heron 1 or Heron 2, to which the response was "Heron 2". The subsequent approach accordingly resulted in my passing the instruction "check wheels" (which at the time was used for "check gear"). The issue was subsequently brought up at the de-brief "what's all this about Heron 1 or Heron 2?", to which I politely pointed out that if it was a Heron 1 then I could omit the gear check!