I agree with SkyTorque, in the UK it happens all the time. Many times an aircraft operating from an airfield with no approach aids will divert into an Instrument equipped aerodrome.
We even have a thing called the Strasser Scheme which encourages it and many airfield/airports in the UK will waive landing fees for genuine weather diversions.
No questions, no inquiries, nowt!
Could it be that the Australian weather (unlike European weather) is either so settled/unsettled that this non event (to us) sparks an inquiry?