2 Sheds:
I have no idea what, if any, transponder code was squawked. I personally videotaped the radar replay of the mull of kintyre for the relevant period and there was no primary nor secondary return. In that area radar coverage is poor from ScOACC as it can only be covered by the Lowther or the Tiree, hence we would hand our low level descents in that area to Machrahanish before it closed.
The single call we got appeared to be just the usual initial call, no hint of panic or stress.