After some searching on the internet and a couple of phone calls I identified the “cheap” supplier of containers in Coffs Harbour no longer stocked them.
Plan B had me going back to the more expensive supplier when a good friend interceded on our behalf and managed to obtain a quotation for a standard ISO shipping container at a discounted rate (Thanks Trevor!)
All I now have to do is confirm the purchase and ask our eldest son to pick a suitable container from the stack. Preferably one with no holes; a complete floor; and does not smell of some foul product it has previously carried.
We will give the container a lick of paint and cover it with a tarpaulin to keep everything dry and secure whilst we are away