Ok, I’ve finally got round to trying this out. I’ve found the code location in header.php and amended the code (in fact I copied and pasted) from the link that was provided above.
I tried something simple, like List Pages by Page Order but all that happened was all my pages (and sub-pages) appeared in a mess across the header. I tried using the Include Pages in List option, and selected only Parent Page IDs, but the same happened.
I’ve tried most of the options on that link above, but they all come up with the same result.
I’m running 1.5.2, so those instructions should work ok, it says they’re for 1.5 and above.
Is something conflicting with my code?