Believe me, I feel your pain. We've had to do the visa process twice now. Once for my wife to stay in the UK, and now for me to stay in Canada. It's a horrible feeling having your future in the hands of bureaucrats. But try not to panic! Your case is genuine, and if they do have any questions or doubts about the application they will give you plenty of chance to explain it all out. And with any luck, you'll have him landed in September. It seems that London is picking up the pace so hopefully you won't have to wait as long as some poor unfortunates on here!
So, keep calm, and carry on!