Many countries have a minimum daily charge then the cost of fuel consumed on top.
There are some quirky DIY ways I’ve seen where people create virtual meters that count the cost over a whole day, but it would be so much easier if it was directly available in the energy dashboard.
e.g. 44p standing charge + 28p per Kw consumed.
If 15Kw is used then (15*28)+40 = £4.60 total