I can’t tell what solved it but I have them back. Perhaps it was “turn it off and on again”
I did remove the USB from the vero first and did the tuner on/off, then reboot due to power cycling the tuner causing a crash
Thanks for your help, hoping the USB storage for recording set up doesn’t cause drama
I did lose the tuners again later after some other issues but got them back with:
-power down
-switch off tuner at the hub switch
-power up
-switch on tuner at the hub
No crash this time and the tuners appeared in TVH