Hi Darren,
I looked around a bit in the documentation we have on this.
http://docwiki.cisco.com/wiki/Unified_Communications_Virtualization_Sizing_Guidelines#UCS_C-Series_Co-Residence_Requirements
Supported Cisco Unified Communications IP telephony applications can be co-resident on C210 M1 Reference Configuration 2 and Reference Configuration 3, in any combination that does not oversubscribe hardware. For example, multiple instances of Cisco Unified Communications Manager and Cisco Unity Connection can co-reside together on the same server as long as there is no oversubscription of either CPU cores or RAM.
At this time, if a Cisco Unity Connection virtual machine is loaded and running, an idle/unused CPU core (vCPU) must remain available for VMware ESXi. This allows the ESXi scheduler to properly schedule and allow for predictable real-time audio streaming which Cisco Unity Connection voice messaging depends on.
At this time there is no support for co-residency with non-Unified Communications Cisco applications, nor with third-party applications.
From supported servers doc:
Reference Configuration 1 (UCS-C210M1-VCD1)
Reference Configuration 2 (UCS-C210M1-VCD2)
So I would understand you cannot use VCD1 for coresident VM's. More info on the parts for UCS-C210M1-VCD2
From Cisco Unified Communications on the Cisco Unified Computing System
VMWare license = VMW-UC-STD-K9-1A
I hope this helps a bit?