Originally Posted by David Hill

I suspect that few have tried to grow caulies under glass or polythene
over winter because of the space they take up, if you have spare space
then give it a try, look for a small variety of winter cauliflower, they
will have to be sown around May, planted into the tunnel end of
June/July so will be taking up space fpr a lot of the time you would
want the room for other crops.
I wouldn't bother