The site is now live.
The Balbooa gallery component has gone, as I couldn't get it to display the images as I wanted - I really don't like the lightbox style presentations used by this and other gallery components.
The site now uses Juicebox galleries, which, after some fiddling, I have set up with a presentation that I like. Although not a Joomla component, the JB galleries can be easily embedded in Joomla articles, and generally work well. There is also a Lightroom plugin available, enabling galleries to be created directly from within Lightroom, which is convenient.