Hi Martin,
I suppose we live and learn. I had received earlier advice to avoid some of the odd years (with the exception of 1991 and 1999 which I understand to have been reasonable years in SA and WA), which I followed . However, when it came to some deals - which looked pretty good for known wines and known storage conditions, I tended to rely on Jeremy Oliver's ratings. He rates each of the wines you mention well into the 90's.
I suspected I was taking a risk but I found a number of older wines from a good source and the prices were pretty good in comparison to the auctions. I am a bit tentative in the auctions and have really only given them a try on wines I can't get anywhere else. Managed to pick up some corkers today at auction - beware, the prices will hurt!
3 x Penfolds Bin 90A (2@$180 and 1@$200)
1 x Bin 920 ($140!!)
Regards,
Allan