To be accurate in order to see the fight at around 5 a.m, you must be a subscriber to Sky sports. This is an expensive service that places boxing, way down the list in its sports output. So no, it isn’t free in the UK!
Wow really that's how much it costs? Here you can get it for like 10$ from third party streamers in 4K. Or just wait for someone to live broadcast it in social media.