Hi MammyKaz,
Sorry, I missed your post completely!
We ended up using Nair Sensitive on DD's underarms, she got quite itchy after 5 minutes so we rinsed it off, but she was really happy that the hair was gone. We've had some slight regrowth after 2-3 weeks, so I think we'll probably do it again this week. Paediatrician said it was fine to do this. In the meantime we'll just carry on with the showering in her swimsuit.
She starts a new school next term, and will also be swimming in school. I don't know whether to approach it with her form teacher - I haven't done this in the past, and rightly or wrongly, I'm a bit reluctant to discuss it this year as she has a male form teacher for the first time. There is a school nurse, whom I might mention it to.
I use the Dr Organic roll-ons for her - I've currently got the honey one which is a bit overpowering, might go for something a bit less sickly next time!
Dr Organic Deodorants
You can get them from Holland and Barrett.
I've been quite conscious of her body odour, especially since it's been so hot. She hasn't mentioned that anyone has said anything to her, but I do encourage her to wash under her arms in the mornings, and also if it's noticeable after she's been playing. I feel bad about this, as I don't want her to be self-conscious, but she does have quite a strong smell when she's been sweating.