The whirlpool's in the Gulf of Corryvreckan, Sinshull. It's a stretch of water between the northern tip of Jura and the southern end of Scarba, where the tide runs at 12 knots, and I had the 'pleasure' of sailing through there a few years ago. The rock which causes the whirlpool also produces a 5-metre standing wave which we went through - very pants-pooing!