Windows seals replaced by unbonding the fixed glass on one side; slow job sliding a razor blade along flat, this allowed the frame to be flexed enough to fit the sliding glass back in after fitting the seals.
Used black Sikaflex 295 UV sealant to rebond the fixed glass and as a bed for the seals. All cured now and fitted on the boat sealed using Arbomask.
Took 3 hours to rebuild the window, most of that was removing the old silicon. I think a professional would probably take 2, so much for 'up to 5 hours'.
Whether this is an approved way of doing the job I'm not sure, it looks ok and the windows slides the full length for the first time since i've had the boat, oooo, the pleasure...
So Graham, no getting chilly when we visit a small island near France...