Just set up a new LibreELEC installation with Tvheadend (both on same box) and it all went remarkably smoothly - thanks to the team.
However whilst my box switches itself on to recorded a scheduled tv programme, I am not sure what the standard approach is to have the box turn itself off after the recording has finished. I have found the following
[ANNOUNCE] TVHeadend Timer- und Powermanagement für XBMC/Kodi - Page 10 - xbmc / kodi - VDR Portal
which I will use if there isn't a standard LibreELEC or better approach.
Thanks,
Bob