The high-voltage transmission grid is operated by National Grid, which is a British company. Distribution to end-users is operated at a regional level by one of six* Distribution Network Operators [1], three of which are British-owned.
Consumers can purchase electricity from any electricity supplier that is willing to sell to them. Naturally, since it all goes into one grid, suppliers are responsible for ensuring that they purchase from generators and sell to consumers an equal amount of electricity. EDF is one of several suppliers in the market. (There were many more until energy prices rose following the Russian invasion of Ukraine and many suppliers collapsed.)
The gas distribution system works similarly, but I'm not familiar with the details.
* It's slightly more complicated, but it rounds to six.
The high-voltage transmission grid is operated by National Grid, which is a British company. Distribution to end-users is operated at a regional level by one of six* Distribution Network Operators [1], three of which are British-owned.
Consumers can purchase electricity from any electricity supplier that is willing to sell to them. Naturally, since it all goes into one grid, suppliers are responsible for ensuring that they purchase from generators and sell to consumers an equal amount of electricity. EDF is one of several suppliers in the market. (There were many more until energy prices rose following the Russian invasion of Ukraine and many suppliers collapsed.)
The gas distribution system works similarly, but I'm not familiar with the details.
* It's slightly more complicated, but it rounds to six.
[1]: https://en.wikipedia.org/wiki/Distribution_network_operator