Then you should use
$startFolder = Get-Datacenter -Name 'Melbourne'
Now I swear I tried that earlier this morning and it failed with an error... I since discovered Mark's script and found it worked a bit better for doing the whole migration so I've been working with that for the rest of the day...
Appreciate the assist, and hopefully anyone else finding this thread is helped out by it.
The BlueFolder or root VM folder is "vm" by default - Get-Folder
This worked for me:
$startFolder = Get-Folder -Name "vm"
This worked perfectly for me, many thanks