I sailed Tweed river today, marginal conditions, I'd finished up when imagine my surprise when I saw another mad keen windsurfer out there! Yep Dave had joined in, although with his 5.2 he was having even more trouble than me to get planing...
Wind was 8-12 knots, almost no whitecaps on the 10cm chop.
I spent 2 hours on the water, and between me and Dave we had a combined total of 10 seconds planing time.

Still, good to get wet, beats sailing a desk I guess.