The is no branding or power specification on the box (I've got an issue 3 machine with a linear supply that has the BBC TV logo on it). The label on the lid says 'disconnect the mains supply before removing the cover. Not sure if this refers to the plastic case of the BBC. You can't read that label until you have removed that cover.
Or does it refer to the metal case of the PSU, which is riveted shut. It should maybe say 'disconnect mains supply before drilling out rivets', but hopefully no one is going to try that. I've not opened this one up, as I don't see any evidence this is anything but a simple linear supply (with a nice torriodal transformer), and no nasty Rifa brand capacitors to ruin your day.
why I've had so much trouble taking screenshots). The BNC monitor output is luminance only - later Beeb's had a jumper to merge in chrominance data, but that reduced the quality on monochrome monitors as you would see the chroma dots, so it was optional.
BBC Model B. A far more usable machine, especially with one of these by it's side, but more about those later.