There's tax and there's tax ....
If your business plan is to be a self-employed freelance pilot, and can demonstrate that to HMRC, then you can easily become registered for VAT and claim the VAT back on your training. This means that when you invoice your clients for flying services rendered, you will charge VAT and will have to submit regular returns for VAT. If you don't know what I'm talking about, get professional advice.
From an income tax point of view, obtaining tax relief for training, is very difficult and I would recommend professional advice from either Chartered or Certified Accountants.
I am not prepared to give such advice over a forum from someone whom I have never met.