UK's fetish for STEM subjects? Faith Cunningham Bancroft's School

The holy trinity of A-Level subjects; Biology, Chemistry and Maths. Not only is this the most popular combo at A-Level, but it paves the way for future veterinarians, doctors and dentists, engineers and software developers. But, accounting for 30% of all A-Levels taken in 2020, this trend introduces the burning question. What is happening to all the other subjects?