Thank you for all your messages. It's given me hope that there is still a chance!
JJ, it would be good to have a chat. Dh is away at the moment so I don't have much time to email but I will be in contact when he gets back.
Foxinsocks, I realised after I posted that it sounded like this was the nursery's fault. Infact they are fantastic and I couldn't ask them to do more for ds, or be more vigilant.
It was actually my decision to let him try playing with the dough and I was there incase he did react. He had an egg challenge in hospital last year and reacted straight away. The doctors agreed that there was no point in even trying a milk challenge as I could reel off so many incidents of him reacting to milk eg. me touching a milk carton and then touching him, me kissing him after eating ice cream.
We haven't had any incidents like that for about 6 months now though, and I was hoping that perhaps I was being unnecessarily cautious - obviously not!
I'm not very keen on having another challenge at the moment because putting the canula ( I think that's what you call it anyway - the tube incase he needed IV adrenelin) in was so awful, and I found the fact that we had to stay there all afternoon having his bp and temp monitored after a relatively small reaction (in his terms) quite farsical.
I was as confident as you can be that he wouldn't have an anaphylactic reaction as long as none of the dough went near his mouth, so this was my way of challenging him in the same type of way that LizP was advised to do.
I appreciate what you said about skin prick tests though and have sometimes wondered if his skin reacts more than he would if he actually ate something. However, on the basis of previous reactions, there's no way I would deliberately give him something to eat and as it seems that a food challenge would still get no further than a touch of food around his mouth, perhaps the only way that we will find out is through somebody accidentally giving him dairy or egg.
I can't see that happening at the moment though as I had already managed to put the fear of God into all our friends and relatives about what would happen if they go anywhere near him with these products, and I know that the nursery will make extra sure that no mistakes happen after seeing his reaction to the dough!
How does your dd cope with her milk allergy coral? Ds is so sensible even though he is only 3. Somebody asked him if he wanted butter the other day even though they meant dairy free spread and were holding his packet of spread, but he still said no as he knows he can't have butter. However, when we're playing he says things like "This is a sad shop, there's nothing for me in here" which really upsets me. He also looks longingly at the cakes at birthday parties even though I always make a substitute one for him.
Thanks again for all your messages I really appreciated them.