Yes I can enable SSH through the vcenter and directly on the host via cli but I cannot connect via ssh - it enables then disables, which I think is part of the disk space issue on the host.
I think I'm either stuck with finding a cli option or else a rather ungraceful restart of the host and restarting VMs on other hosts in the cluster. Trying to avoid this as this host runs around 50 VMs at present so not a trivial process 