Hi Alices, I am a dentist although I don't treat children generally but I will impart my knowledge:
It sounds like (although no-one can tell without a proper in person examination) like your son has what we call a class 2 occlusion, with this, it is important he is seen during his growth phase, not afterwards as certain appliances (as mentioned above, a functional appliance) can help to align the facial growth into a class 1 (the average) profile.
Now, some PCTs have stopped all funding for orthodontics. This means that no matter how bad the teeth are, the NHS will not fund the treatment. This isn't the dentist or orthodontist's fault, it is the government cutting the health budget and the PCT deciding that chemotherapy is more important that braces.
If you are that 14 year old boy being bullied because of your teeth it is a different matter, however, I acknowledge that orthodontics are expensive if you are unfortunate enough to be in an PCT where they won't fund the treatment.
So I think you have two options.
1: Take your PCT to judicial review if they won't fund the treatment.
2: Fund the treatment privately.
The first option may be what is morally correct, the second option will be cheaper.
Many orthodontists will have payment plans etc etc but ultimately it is up to your family to decide (if NHS treatment) isn't available, whether it is worth sacrifices to get the treatment (which is most successful when carried out during growth phase) or not.
I don't have children so can't say what I would do.
Please message me for any specific queries.
Hope I've helped in a small way.