Thanks nmrao but I'm not having much luck with my specific scenario and finding what I need, Groovy examples seem very sparce and documentation extremly poor, and I'm having to figure this out myself. I you happen to have an example that would be much appreciated.
Okay I have figured out a solution that will delete all files after test execution (ideally I would like them to be deleted as they receive a response but I have not found antything that would allow this) also I would love if this was a test step in the GUI of Soap UI, like 'Delete File(s)':
File xmlFolder = new File("C:/test/XML Files")
xmlFolder.eachFileMatch(~/.*.xml/) {
file - >
log.info("${file.name} will now be deleted")
file.delete()
}