I've been playing with the setup of this clock and have discovered that the BBC Micro Bit single board computer that I used is a Version 2 board – at the time I was working on it I was unaware that there were multiple versions of the board, and I bought 2 more which turn out to be Version 1 boards. To cut to the chase, during my messings around today I was programming a V1 board and plugging it into the breakout board, only to find that it wasn't working as it should, whereas the original V2 board continued to work just fine. I haven't yet figured out why there was a problem and I probably won't spend any time on it – my solution is going to be to sell off the V1 boards and get a couple more V2 – but just a heads up that the information in the article series relates to the V2 board.
I think I posted elsewhere that the code, which was printed in the articles, was a bit of an eye chart, and that the original JPEG files are in my album. If anyone wants the HEX file drop me a message and I will email the file.