Off topic for a moment to reply to Dave...
Hi Dave, you seem to have been away from the forum for ages.
I'm very pleased that you are making great use of the draught excluder/wind-break accessory and finding it to be effective.
Hopefully thi s will mean you will be able to enjoy the car during the winter months with the roof open too, and not just be a summer open air motorist. I actually preferred driving it on those wonderful clear-skied sunny winter days as you arent subject to the scorching sun! You just need a good coat with a high collar and some thin but warm leather gloves such as
THESE, although I use
THIS TYPE as the thin padding on the backs assists in keeping the hands warm.
There may be a way of slightly improving the draught exclusion on that wind/break; I thought of doing something but never got around to it.
If you could somehow reduce or even completely eliminate the gap between the seats/trim and the edges of the frame of the wind-break, I am 90% certain you will significantly get a lot less cold air around your legs.
I thought about using some of that grey foam used for lagging pipes to try and make the gap smaller - I just never did it and I wish I had tried.
If you try it just be careful not to damage the mesh - even foam rubbing on the mesh might wear a hole in it so you could use something like that low-adhesive blue masking tape on the mesh to protect it from the foam.
Just a thought.
Sorry to go off topic!