I found two Semillons in Decanter's December issue that included a brief
listing of 4000 of their wine reviews in 2004. These likely are not 30
year wines, but they might make good drinking now and for a few years.

Belgravia, Late Harvest Semillon, Orange 2002, 375 ml, 7.25 Pounds, 4
out of 5 stars rating. Most likely a rather sweet wine.

Peter Lehmann Semillon, Barossa 2002, 5.49 Pounds, 4 out of 5 star
rating. It looks as if they found a real bargin here.

Both of these wines were available in the UK, but I have no idea what
their distribution may have been elsewhere.

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