You would be applying to universities next year in Year 13. Consider getting a (non-useless) degree unrelated to aviation.
I was actually in your position, I am currently 19. I went to Uni and completed first year. I wanted to fly so badly you would not believe it... I dropped out and started my PPL with the ATPL in mind.
I resisted this temptation of carrying onto ATPL and all the other modular courses as it is VERY risky and will soon be going back to University to finish my degree.
I'll soon be receiving my PPL and I'm happier than ever now that I can simply just rent an aircraft when the feelings kick in!
Aviation is extremely unstable and no pilot will know where he'll be in the next year. Also, have we actually gotten to the point where we're willing to spend £110k on a scheme which doesn't even guarantee you a job? Makes me feel sick inside, to say the least.
You are young, you have so many opportunities...open as many doors as possible, while you still can.