What's the deal with gbnews?

Ok so I left Britain more than 15 years ago and have been living in Norway, blissfully unaware of what's been happening. I recently went back to visit family, where I notice that my dad's had a bit of a swing to the right, politically speaking. At some point he put on gbnews.

WHAT THE ACTUAL FUCK?!?

How popular is this blatant propaganda?