As for the gender balance, that is most likely a product of the sexism in society in general. The reality is that fewer people will watch a show hosted by a woman. There was even an interview with the children's laureate a few weeks ago who said that if she writes a book with a female lead character, it won't sell as many copies, because while girls will read books with a male lead, boys won't read books with a female lead (or perhaps parents won't buy books for a boy with a female lead). It is changing though, with some massive hits being hosted by women, like Bake Off and Strictly. But I think it will be quite a few years before it's not a newsworthy point to have even an equal number of women on a TV show.