Okay, seems to be working now - sorry for the fuss. I think I'd unchecked 'Fatigue model' rather than selecting 'Fatigue model' with 'No fatigue'. The mouse over help for this says that unselecting 'Fatigue model' keeps your current settings - so in my case fatigue was still on.
At least that's what I think happened as using 'Fatigue model' and 'No fatigue' seems to have sorted it.
Now to find some tommies...
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