Yes, sorry if I sounded aggressive mate

'Poor' British weather creating too much trouble

hehehe
Yes, I hear you mate. I, too, have read accounts that said how the Irvin was just not suitable for fighter use (unless the weather really was that cold). Although it gets cold upstairs, the Irvin limits head-movement, as you said, which is essential in combat.
In one of Derek Robinson's books, he suggests that the pilots cut the collars off, but I believe this to be a myth. I doubt they'd have wanted to do this to such a prized item anyway

The BoB was quite hot, and many apparently flew in shirts...
Can any flyers comment on this? would this have been unbearably cold, even in the hot summer? I'm not sure whether this is true, or a myth, as many pictures were staged.