The majority of residential properties in the UK use a single-phase electricity feed for power, to have a product that suits this, we would recommend ensuring you have the LED Version of our product, which measures usage via the flashing LED Pulse on the face of your electricity meter.
You can order our LED System which can be found here:
https://www.amazon.co.uk/geo-Minim-Energy-Monitor-Self-Installed/dp/B018WB6IXG/ref=sr_1_1?dchild=1&keywords=minim+led+geo&qid=1616082777&sr=8-1