Saj: Thanks again for all your detail above. As for working out how to do certain things on this forum; attach an image, copy code, upload a bootstrap studio file; definitely struggling with that. (I even tried to, on my server, post some pics to make it easy for everyone but even I couldn't see them on my own browser - lol!)
Jo: Good question but I find it hard to answer as I had a lot going on when I first started this thread... In fact, so much going on, that I'll jot those things down as a postscript so as you don't die of boredom!
The short answer though is that I just edited the index.html file - I definitely did not make those changes in Bootstrap Studio (pretty sure, as you said, they can't be.)
Still have lots of questions (not on nested accordions though!)...
I think they will be obvious/newbie questions, so I'll start another thread later once I am sure I am not being a complete idiot!
:)
Pat
P.S. I won't even begin to talk about joomla, drupal, wordpress and how much time that all cost! And phpbb3.0 versusphpbb3.1 - who would think there would be much of a difference? But there is!
Innocent old me thought that "add-ons" for Wordpress/Joomla/Drupal/whatever would just work. It took me months of self-doubt and research to realise that they commonly don't work! I then "grew up" and realised that any vehicle I chose would not be intuitive/easy. Decided to go for phpBB3.1 for many reasons (not saying it has been easy though!)
[Insert a billion problems here, not necessarily phpBB related]
... When I started this thread, I had just swapped from a shared server to a dedicated one but load times on the main page rose from about 5 secs to sometimes over 50 secs. That's just one example of many IT probs going on when I first posted above.
And, that is one example of why I really appreciate the time you troops have put in above.