When you click the Zoo to Day link from the royalnavy.mod.uk site on dii, it brings up the DFTS blocker page, which informs us:
"The page or file you have requested has content which is not allowed according to MoD Security Policy. This could be for a number of reasons - but for your guidance it may be because:
The site may contain offensive content.
e.g. hate/sex/violence. "