It seems to be pretty easy.Just come from an expensive public school, and have fellow ex school fellows give you a job on at least £100,000 a year.
I;ve been involved, yes. The first question is whether you need actual charity status. Life is much easier if you don't..
A lot of people do set up as charities in order to apply for certain kinds of funding. I'd suggest with a new venture to not become a charity just for financial reasons. There are lots of other formats you can use and you can raise money with various structures. There are various hoops to jump through, including financial accountablity procedures that can end up becoming onorous. The Charity Commission closely monitors who is doing what. https://www.gov.uk/setting-up-charity