Myst:
Thanks - I thought that may have been be the case
I feel the easier option might be for me to replace the TV's with ones that support HDMI-CEC - although finding 24inch hdmi - cec enabled TV's has proven tricky.
Harmony remotes are OK - but adds another layer of fluffing about - and I would like to keep the remote with the google assistant buttons etc
I've always found HDMI-CEC either works great, not at all or inbetween in that weird things happen such as HDMI source gets changed with another device fights for control. If I remember right, with the SmartVU it did the opposite ie turn TV on it turns SmartVU off, so I ended up disabling it.