Ok great thanks - the link was just what i was looking for. Although i'm still not fully clear on the NUMA nodes. I assume as i have a 6 core processor (x2) with hyperthreading that if the vCPUs i require per VM is 6 or less then wide and flat is not entirely necessary but its a safe rule to apply.
So the license that is applied to the host by CPU sockets is only relevant to the host and doesn't affect the amount of vCPUs i can apply to the VMs, this is only affected by what is supported by that OS.