I was browsing through some old posts in this section, when I came across a reference to Mathematical Models by Cundy & Rollet. A little later, I was wasting a few minutes on Amazon, and by coincidence I saw that they now have paperback copies in stock. The book itself is decades old – I still have the copy I bought as a schoolboy donkey’s years ago – so I thought I’d mention it in case anyone here was looking for a copy.
And yes, I'm at a bit of a loose end...
Pete K