IndigoBell - surely, though, if your son is a fluent reader, taking him back over the concepts of phonics wouldn't be that difficult or laborious (providing you, or someone you paid, had the patience to do so - I can well understand that school has other priorities if your son can read)?
I learned to read a very long time ago, and pretty much taught myself at home, before reading had been tackled at school (so jumped a class at school aged 4). I am a very good reader and have pursued an awful lot of education. Nonetheless, when it came to teaching my DD to read in English, I needed to get a grip on how to do so as I was going to be employing a tutor and buying a reading scheme. I must admit that I learned things about phoneme-grapheme correspondences that I did not know; I am also in awe at how quickly my DD can read, correctly, a very long word (in both French and English) that she has not previously encountered and I know that is down to the fact that she has been taught phonics and blending.