No luck clearing space on ATV 2

I seem to have a problem getting the free space on my Apple TV to change, let alone increase after cleaning. I have gone to the 4 locations listed in the FAQ for IOS, and indeed found stuff in each location. Between them all, that amounts to around 150mb. However, after deleting, the space left is the same - 62 meg. Am I being daft and missing something obvious? I have had a good trawl about in the forums, and via google, but thus far can't find anything that could help. As a side note, this seems to be the same on the ATV I set up at my folks, and also the same space left after a fresh install on both. Am I being haunted? Dunno - anyway - has anyone seen this before? I'd be eternally grateful any for suggestions.

ssh in, sudo du -h /

look at what's taking up the space.