Failed to get into test image. Some sort of corruption. Went onto the board and booted test image again. It came up, and we got a command prompt, but it was still pretty flakey:
https://pastebin.linaro.org/1129/Although a reboot of the test image *might* have fixed this, it looks like either the test image was dodgy, or the board is genuinely failing. I've put back online to test.