The companies I have so far spoken to, find it difficult to give me a full figure in black and white.
If you seriously want to train as a helicopter pilot then you had better get used to that response. Ok, you asked for advice. You will no doubt receive much positive encouragement from the rose-tinted spectacles brigade but I hope you will also get realistic advice from others.
Other than the fact that you are living in rented accommodation and your wife will shortly start a 4 year degree course I don't know your circumstances. But if you can live without an income for 12 months whilst quickly spending £100,000+ and support your wife knowing that the chances of employment are minimal at the end of it then go for it.
I wouldn't do it - but then I'm not you. I am divorced though and I hope that the house you sold was a mansion.