Lets say it is only £40,000.00
You will not get a unsecured loan for that amount.
At 22 i would be shocked if you could get a unsecured loan for anywhere near £20,000.
But if you get a loan, you will be ecpected to start paying it back one month after you take the money, so how are ypu going to pay £500 per month while you train?
What will happen, when you have a nice shinny CPL and only 200 hours . I dont see many airlines queing up to take you. Are you going to try to get into instructing?