The BM was better than forecast suggested, we had plenty of twin wiring both upwind and down, but really paid the price in the light wind bits and in amongst the traffic which seemed to coincide with the light bits. Launching and recovery was easy as there was plenty of people around to lift us straight in. We arrived at 11am and drove out again at 4pm without a problem or holdup.
Well worth the effort in the end, not sure that our result is correct though but it doesn't really matter to be honest.