That looks really good, thanks - @TrystanLea.
Oh there is a specific SDM120 interfacer so not sure this is the right way to go (but it might be!). emonhub/EmonHubSDM120Interfacer.py at master · openenergymonitor/emonhub · GitHub
@TrystanLea I see the recent discussion around ModBus (Installing Emoncms onto a PC (or Mac) and using with multiple modbus meters (e.g. SDM230) - #8 by thedawnbefore) the Minimal Interfacer is being used rather than the SDM120 one so I am confused (easily done)!