Pulling a bottle at random out of my cellar, 2005 Filsell Old Vine is in screwcap. Older wines are not, and most are also bottled in cork; perhaps in your country the distributor is too lazy to import both? All the Burge that I've bought in the past year has been in screwcap as I buy directly from the winery. Since you don't believe me, read any of the reviews of Grant Burge wines, when closure is mentioned it is almost always screwcap and not cork these days. More interestingly Grant Burge himself is quoted in a Wine Enthusiast article that "down the road it will be100% screw cap". Grant has been well known as an advocate of cork for many years but that is not the case today ... he does make some very fine wine, using some daring techniques such as the extended maceration.