Just read this by Springfield Estate whose wines are stocked by TWS - but not currently.
It is a sad fact, however, that sometimes ones best efforts are not enough. When we still used natural cork on our wines, we bought the most expensive cork money could buy - one that went through extra, rigorous tests to minimise the risk of TCA contamination. Unfortunately, even though all these steps were taken, we still had problems with batches of corked wines - wines that you had kept for a special occasion, or that you had brought out to impress guests with. While the fault is not ours, we are still the ones to shoulder the blame - which is one of the main reasons we have moved over to Diam corks, a cork that is 99.9% guaranteed against cork taint.