Apologies - I didn't mean this to be a new thread...anyway.
I've forgotten how to access the engine db and run the queries above but I had an idea
the following may work.
The resolution for now was to clone the VMs that weren't in any OVF_STORE. The
geo-replicated volume was then imported on the DR site and VMs successfully imported.
Thanks for your advice above, I'll make a note should I come across a similar issue.
Kind Regards
Simon...