Your 16 now and ideally you'd be better of doing your training on the younger side of 30.
You have over 10 years to save £70k to do your training debt free ... that is some achievement! £70k means you've probably opted for the integrated route already?
If you saved for your PPL for the next 2 years I'm sure you'd have your PPL by the time you're 19. At which point you have the option of Job or Uni (this is another thread in it's own).
If you got yourself a job you've have the outstanding £30k call it to get to the fATPL within 3 years? so at 25 you'll be a debt free fATPL pilot.
If you go to Uni then you have a back up career and more life experience albeit with a small student debt. After finishing Uni work for £20k+ per year and then spend your hard earned cash on training, you'll probably be in your late 20's and have a BSc/fATPL/Life experience/Debt Free.
Can't really help on the £70k route as I've already cut that option off my plan. But your best option might be go to the CTC route, only 2% of applicants get in but you're pretty much guaranteed a job afterwards. You can get a £50k loan on integrated routes which will be a help too.
Good luck.