In reply to G3CWI:
Possibly, Richard! My lot were absolutely **** hot on trigonometry, vectors, stats and calculus but ignored other areas so Tom’s terminology is double dutch to me - though I vaguely remember seeing “factorial” on my first scientific calculator!
Just for reference, I went to a Technical School and left at fifteen as nearly all did then, we had three periods a week each of physics and chemistry, a half day each of metalwork, carpentry and engineering drawing, and I remember a glorious workshop with working examples of every type of engine one might expect to meet with from a beam engine to a small jet! A different world…