Hi Cath, Im assuming that with you not getting St Jospeh's you're not Catholic.
I know St Joe's is very popular with it only being a small school, but if you live in Handsworth I suppose the down sides are that the children from St Joe's aren't necassarily from Handsworth so from a social point of view your son's friends may not live local which could be unfortunate if he wants to play out with them etc when he's older.
Also if you aren't Catholic you may find yourslf in the same situation when applying for secondary as most of the chidlren from St Joe's go to All Saints and if he doesn't get accepted there he could be going alone to Handsworth Grange.
I know it's disappointing not getting the school you wanted, why not take a look around Athelstan woth your son, have a chat with the teachers and see if your mind is changed!
Good lucy with it all.