WooHoo! The machine lives! It appears to have been a USB stick that went corrupt with the first file I put on it. A new stick has solved all of the issues I was experiencing. A very simple fix that was discovered when an engineer sent me a known good file. I could not get it onto the Snapmaker USB stick which was now no longer recognised but it was able to sit on my new USB stick (Sandisk) and the file worked as it should. Whatever the log-jam was, it has all been resolved and I am delighted. 
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