Let's say Huw Edwards gets paid £600,000 a year, as has been published in the papers. He presents the BBC News at 10 for five days a week, 52 weeks a year. By my estimate that would mean he earns £2307 a day or £288 an hour (for an eight hour day). However, this does not take into account the fact that he also hosted (until very recently) the Wales Report on BBC Wales. He also did a a series of programs for the BBC covering the Aberfan disaster.
The reason he got paid more than nearly everyone else is because he's the flagship presenter for the BBC's flagship news program five days a week and that he does other programs.
This is before you even get into how much work actually goes into making those programs. He doesn't simply read off the autocue, he helps to write the script. He deals with any breaking news/late changes to the script that happen while he's on air and he does it while giving nothing away to the audience. He actually hosts two hour long programs on the day - one at 5pm on the News Channel and the usual 10pm one on BBC One.