@Hope4All Cause and effect are not for the most part related here.
The UK is a cold damp rock witha very high population density, with crap solar options, little to no geothermal, very little pump storage or hydro opportunity (no real mountains), no land connections for energy transit and limited space for wind (even if we got rid of the nimbys).

Our energy prices suck for a lot of reasons but the structure of the energy businesses is really only a small part of it