All,
thank you for your help with this. My old company had an outsourced TA - Hogg Robinson - and I am trying to talk to their SME team; at the new company there will only really be two of us with this kind of travel, so I imagine it will be tough to get them to help us out.
I have tried the Amex plat concierge, but the experience was not that good (fine for point to point, but they got very confused with something more complex).
Will keep looking.
Thanks again for the help.
RP