In the article by Sturdy Colls et al. (Reference Sturdy Colls, Kerti and Colls2020), one of the images in Figure 10 was inadvertently reproduced without formal permission and has been replaced in the print and online versions with an alternative equivalent. The replacement figure is also reproduced below. The authors apologise for the error.

Figure 10. Photogrammetry of the tunnel and subterranean room that connected the Commandant's house to the camp; bottom right) photograph of the tunnel (images: Centre of Archaeology, Staffordshire University). The photograph at the bottom right has been updated due to a permissions issue.