After a bit of trial and error I have the spindle running although clarification would be good on what the intermediate frequency does.
P00. 220
P01. 400
P02 15
P03. 200. Changing this from 25 up to 200 resolved the matter. Not happy at 100 but ok at 300. Spindle starts to rotate when this value reached.
P04. 0
P05. 0
P06 400
P07. 0
P78. 8000

Be interested to see how your values compare.

It suggests to me that the VFD is defaulted for a 3ph 50 Hz motor and once you come away from that various other factors come into play.