Magazine?
EPE or whatever it's called these days is barely a UK mag, editorial and tutorial is UK but the majority of the tech content is bought in from Silicon Chip, I think it's probably the last UK electronics magazine and have been in a slow decline for years, their choice of regurgitated silicon chip microcontroller projects where the source is closed makes it little more than a kit building guide.
The MagPi might be the closest the UK has to an electronics mag these days and it's pretty poor if you want more than simple Pi projects.
You can get Circuit Cellar, Elektor, Nuts and Volts, Silicon Chip and I'm sure many more I can't remember right now but they're all 'overseas' subscriptions and cost if you want a physical copy.