Had the P0814-01 DTC pop up in my Westie 4.4 tdv8 when reviewing dtc’s. It was thrown over a hundred miles ago and not seen anything pop up on the console but there seems to be little info on it other than being a “J Gate” issue which I don’t really understand at this point.

No other noticeable issues and wondering if it’s because the shifter was not engaged properly by mistake or if a service is required?

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One thing you get used to after a while with the GAP IID is a lot of spurious codes and faults. Glitches, low battery voltages, false errors etc.
Don't worry unless it's persistent fault that reappears after clearing the codes. 2012 TDV8 Vogue (L322)