The related image gallery is top right, with the Piccies title. Below that the Live Shows box is a Filtered Item List includelet showing child items of the current folder, that links through to other show pages.
On some pages (e.g., the Flaners and Swann page) you'll also see a See Also... box which is another Filtered Item List includelet which shows items related to the current page.
The site uses the Bootstrap theme with the Superhero colour scheme. I added a few tweaks to the CSS by adding it into the Raw Header HTML block of the theme settings. Mostly to do with altering some image layouts as it seemed easier to do it in CSS than to actually edit the images!