Been down the RHS website which lists withdrawn chemicals this information came up wighty. Obviously people don't stock as customers can't be relied on to use them as directed.

Active ingredient Sulphur (Sulphur candle)
Brand name(s) Growing Success Deadfast Greenhouse sulphur candle. Sulphur candles are still offered as cleaning agents rather than pesticides, and must be used as directed on the label
Main use A general glasshouse fumigant used to kill fungal spores on exposed surfaces
Last date of use 31.12.11