I have worked out why this is happening. In order to clear an erroneous Hardware Storage Status warning in vCenter I had installed the Recommended HP Update "* RECOMMENDED * HP Agentless Management Service Offline Bundle for VMware ESXi 5.x (American, International)". This replaced the hp-smx-provider vib with the hp-smx-limited vib, which clearly doesn't support HP SUM. Reverting to the hp-smx-limited vib restored HP SUM functionality, but also unfortunately restored the invalid warning message too.
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