It's on the SAR if you've asked for that. It will be on the Examiners' report as well (to be released next week mind). Otherwise it has to be deduced from the lowest score that someone is aware of that results in a pass. Why they don't include it as a matter of course include it in your letter baffles me. Same with why they don't include the mark breakdown automatically as well, in this connected day and age. Back in the day your letter would tell you how close you were to passing (if you'd failed) along with how you did on each of the questions (slightly below/below /well below the standard to pass).
The breakdown between Paper A& B is crucial. Mind boggling how that is not released given how much these papers cost. Surely this is a something students ought to know!