I sprayed ordinary DIY store silicon spray into the top and bottom grooves of the back of each seal - obviously I didn't do this on top of the car as this photo suggests!
I also sprayed the area behind the quarter window seal like it says in the repair procedure.
And it is my belief that you want to stop the seal moving against the glass, not encourage it, so after I had refitted each seal, I cleaned the area in contact with the glass using BMW silicone remover - this was $10 or so from my dealer (so $20 or so from yours, I think!).
The result this morning was complete silence - I almost wish the sun that has appeared would go away so that I can see if this holds good this afternoon! I will try to remember to report back if this is a permanent or temporary cure. To be honest, I'm not fussed if it's only temporary as it's so easy to do.
And my deepest thanks to whoever posted the BMW repair procedure in the first place - it may have been on a site concerned with sewing, so I hope you see these thanks.
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