Those in their own home who want to go full nerd can use something like products from
TheEnergyDetective.com (There must be an equivalent in the UK) which records the
use for you. One piece in the package of bits is a wall-wart that implements
a local web page you can look at at home. With more than you need to know.
Our system is set up with knowing use/credit to power company, use by Tesla,
and amount generated (Solar). Only a little bit of it requires an electrician.
Yes, all this is way more than one really needs.