Drive a stake in to the ground and surround with news paper tie some string round the post and run to a point ensuring a slight downward gradient in to the stake and ensure the string is nice and tight.
place more newsapaper around the area and poar plenty of petrol over the paper.
Start placing wood aound the newspaper taking care not to affect the string in any way
Use more petrol over the wood.
Pile more wood up to appropriate size for the space - again ensuring that the string is not impeded.
Obtain one cardboard bog roll tube and cut one side.
Find a good sized rocket (You probably know where I am going here)
Put bog roll round string and rocket and secure using sticky tape.
The rocket MUST be easy to slide along the string a downward gradiant is preferable. The string needs to be tight
When all is ready retire to far end of the string with the rocket and light the fuse -Rocket goes along the string and explodes in the heart of the pile igniting the petrol and one instant fire

I did this many years ago with some friends and it was great - Probably more by good luck than judgement it helps if you have had a few Stellas when lighting the rocket

Stand well back </fireservice>