This has to be a wind up surely? Id be surprised if he earned anywhere near 50k pa. At 4k each he would be in the paper every month with a new story which i doubt he is.It's nonsense.
He has a couple of kids by different mums, and the CSA have an administrative liability order against him, which basically docks a certain amount of any money he gets (mostly benefits) to support his offspring
He has a lucrative living selling stories to the newspapers about all of the kids he has got. He gets paid for the stories, up to £4k at a time, from particular newspapers. At one point he was earning between £40-50k pa out of the press. The stories are all made up, and if you look carefully the same women appear in more than one story.
I don't know if he has 15 kids but he definately has a lot of them kicking about.