Thanks for all the information.
I’ve finished sorting the job lot of track now, and I’ve got enough O Standard 31” (is that the correct term?) to settle in that, plus some 54” curves in amongst them.
54” is a bit big for my available space, so I’ll look for some 42” (this is a size, right?).
There used to be a well-known method of producing space-saving compound curves with Triang and Hornby OO Track, using a mixture of radii so I’ll investigate that too
