If you are with EDF they supply them free. Most energy suppliers have them.
Takes about 2 hours to fit and they have to fit a new box thing which links to the display by wifi!
We have one of those smart meters and it shows you when you boil a kettle, use the hob etc...it is quite sobering to see. We have two sets of lights in the kitchen...halogen ceiling lights, which when switched on send the meter crazy and fluorescent strip lights underneath some wall units...