I was trying to plan a trip close to the RA(T) for the Farnborough Airshow and found that NOTAM J1311/12 (AIC Mauve 059/012 also refers) is not being drawn correctly on SD Plan. It appears to be drawn as a simple circle centered on Farnborough.
Perhaps Tim would like to comment

SkyDemon performed absolutely correctly. We interpret coordinates given in the free-text part of the NOTAM only when we can do so with virtually 100% confidence of accuracy. When you introduce arcs and other items into the text, we cannot be nearly so sure of accuracy so we choose to show the circle of influence instead. We are not willing to take the risk of depicting a shape given in free-text incorrectly, and other software may well have different policies in that regard.

Tim
Many thanks for the explanation. I understand your reasoning.
Perhaps we should convince AUS to ensure that NOTAM originators do so in the correct format.