Tried, that, had to access video by a USB stick, no difference I’m afraid.
I really don’t have any add-ons installed/running, above the default set.
However … I think I might have resolved this now.
I have selected a different HDMI input for the Vero-V on the AVR (Yamaha RX-A2A) which supports slightly different features than the one it was originally connected too. This has stopped all the stuttering.
i.e. the Vero-V is now connected HDMI Input 1 rather than HDMI input 4 as shown in the photo below (which is for a RX-V6A Yamaha AVR which uses the same HDMI board as a the Yamaha RX-V6A).
I think this is a little out of date, so am going to research a little more.
I suspect that the problem was to do with HDMI Passthrough only being implemented on HDMI Inputs 1 thru 3, as shown from the specs below. The Vero-V is now on a HDMI Passthrough port (to the TV) .