Rob,
I looked it up and this was what my car returned full throttle on Wakefield:
"When measured from the dummy grid you were fine, i forget the exact number but something around 87.2 or 87.4. When measured from the pit wall you were over by 1 or 2, but that doesnt matter as the measurement is meant to be at 30m. FYI at scruit I measured a car at 30m, driver was holding the pedal flat to the floor, it couldnt get past 79db. So as we expected, every metre away makes a huge difference. That's also standing with the sensor aimed directly at the noise source, which isnt how it's meant to be done, i wanted to give each car the best chance to fail and all was fine. We did the same thing for sessions on track, testing a lap of a certain car going full noise from pit wall then 10m back, then 20m back, then 30m back - so it's all good."
So Yeah I'm well pissed.