Thanks LucD.
I'm not sure that would work though as plink.exe would require a working ssh connection to the host I believe? (please correct me if that's not right 
)
At the moment I am unable to get ssh working as ideally if I could I'd just connect with WinSCP and remove files manually that way.
What I am hoping for are some CLI/PowerCLI commands that will let me view system partition free space and also to be able to then list contents of directories and remove files etc to free up enough space to allow either SSH to run or to be able to complete vMotions of the running VMs.
Many thanks.