So I have been using the Surface today and not had any major issues with it. I had all the patches applied to my machine after I updated the firmware and there wasn’t anything that caused any problems.
There was another patch required after the other patches were deployed – KB2911106 was the update. Seemed to have a quite a few rolled into it. One of those DEFINITELY did something with the battery hardware as the battery life on my machine briefly dropped to 0 HOURS.
This was a worry, but it soon sorted its self out.
No further problems seen with the hardware, so will see if the charge works this evening and post further (and probably final update regarding this specific issue) tomorrow afternoon.