UPDATE 2: Light'er UP!
A 'perfect' burning day came up yesterday (according to the Bureau of Many-Guesses), so I called the Tassie Fire Brigade to let them know I was doing a burn (Thanks from them!).
I mowed a 10 meter area, set up a 'fire hose' + a metal rake. I also had a 5 litre jug of water & cup for my own hydration. Personally, I wore long cotton shirt & trousers, safety boots, sunglasses and (most importantly) a set of anti-flash gloves & hood [which I still have from my Navy days

]
I set the barrel up on 3 fireplace bricks that I had around the place. Balled-up newsprint & some cardboard into the bottom with
some old engine oil, followed by small branches. Then the rest of the old engine oil...
One match later and within seconds it was all alight and the vortex 'swirl' was happening!
Two observations: 1)
It was so efficient that I was run ragged trying to keep the fire fed... which also (almost) led to me becoming seriously dehydrated!
and 2) The radiated heat was surprising! If I wasn't dressed the way I was I would have had difficulty approaching the barrel at times!
All said, I'm quite pleased with this burn barrel and I thank you all for your suggestions.

roposetoast: