IMO rather than subjecting your boy to the painful allergin tests, try an elimination diet of excluding the P220 and P282 (found in bread). Most bakery fresh bread is P282 free.

Also, most children grow out of their allergies by the time they are 5. I would hold off for a while before trying him again on the P220.

Hope this helps.
wow thanks and thanks trillian tooo ill go look at that site....He has been fine on wholemeal bread so far but ill have to look out i guess.... what other things have that in it