Thank you rainbow and twirlywhirly. That makes me feel a lot calmer. Sometimes when you hear it from CFC, you can't be 100% sure that it's exactly a priority of theirs... IYKWIM.
Klm - as far as a smoking donor goes, my perfect donor was a smoker and we thought long and hard about it. In the end we couldn't control what the donor did while they were cycling and whether they would really stop. So in the end we went with our second choice, a non smoker. We are putting so much on the line with this journey and while a lot of things were out of our control, at least we could be sure we were giving our donor and us the best chance to have healthy eggs.