Oh, @MrsAvocet , what a rabbit hole you have hinted at! It’s fascinating.
The first page I found was, for combinations of 3 (or 2) subjects, comparing the grades. Unfortunately it only allows you to choose subjects which had 2500+ entrants so no PE, and I didn’t know which English to choose.
Nonetheless, for the 30 students taking English language and literature, History and Maths ( the most popular A level) last year, the most common grade was B for History, A or B for English - and all grades were equally likely for Maths.
For just English literature and History the most common grade was a B, in both.
For the 9710 students taking Maths, F Maths and Physics, more students got A star for Maths than all the other grades put together, for Physics more got A than A star, and for F Maths the A and A star results were broadly similar.
There are all sorts of conclusions and caveats to be considered here, but I think it’s good general knowledge so worth the time spent on it.