Good post. Only didn't quote the whole thing for brevity.
The Sirocco came out in 1982. The German barrels turned up in mid-84. Anschutz in .177" and .22". Diana (M&G) for the .20". For a while you could get special unchoked barrels to use with Prometheus pellets (if you had fallen for the hype - I did, briefly; the enthusiasm lasted for about 50 shots, happily I didn't buy a new rifle especially to shoot them through).
I would rather like a very early Sirocco, particularly the 1982 first model (failing that, the perfected late 1984 Anschutz-barrelled one). But I cannot recall seeing any of the former up for sale in the last ten years, and only one or two of the latter.
I suspect the early Sirocco sold quite slowly. As I said earlier, it was the most expensive factory sporter you could buy, and a lot of people weren't exactly lush with cash in the early Thatcher years.