Congratulations indeed on your results.
However, I would also urge you to go on to A levels and ideally get a degree. While a degree is not mandatory to be an airline pilot in the UK, it is in many other countries and as there is an oversupply of pilots at the moment inevitably the qualification requirements will increase. Having a degree will make you more competitive but will also give you a fall-back option, should your piloting career not work out.
Also, while you clearly should pursue subjects like maths, chemistry and physics, i'd urge you to also consider economics and possibly a foreign language. Economics will give you an understanding of how industry - including aviation - works. It will also enable you to think clearly about supply, demand and risk, concepts which, it seems, some wannabes can't get their heads around!
Good luck