Restoring lost iphone photos after update?

Right, basically my dad is a right techno noob and he has not backed up his iphone since january (or so it says). He has recently just installed the new ios6 and after this he has lost all of his photos and is only able to get a back up from that of january. Surely itunes would have backed it up before the update?

It doesn't look as though the photos are on the phone at all, but i was wondering if they would have been stored anywhere?

any help would be great

No iTunes don't back up before the update so everything is wiped unless he backed up to iCloud before he updated (that is usually done when charged and connected to Wi-Fi )