Stage 1 - No idea, though I did ask the question at MOTU
Stage 2 - Great description by Rossian at #4 - though you missed the stats board they kept at ISK giving the total of buoys 'dropped' and the relevant saving to HM the Qs purse.
Stage 3 - Was passive data tramsmitted to the Nimrod MR1 crews from actual recordings of contacts - though from recollection there was a debate as to whether broadcasting these tapes for the Wet team to analyse could be viewed as a security problem. In the end the answer was no becasue the actual analysis was condcuted inside the aircraft while operating in D807. But the ACT on the MR2 meant goodbye to all that, and to the tomatoes that the ISK Satge 2 team used to grow.