I've been learning theory for many years. I'm self taught using lots of great books (many from ABRSM). My reasons for learning theory wasn't to become good at playing an instrument. I'm a software developer who develops applications relating to theory. I also study and research many different genres which requires me to be able to read music, and understand tonal harmony. I am a musician, but I'm by far no pianist.
I'd like to start taking the theory exams only, without doing the practical exams. At some point I may decide to do the practical exams, but not right now.
Is this possible or does ABRSM require practical exams to progress through the theory exams?