The problem he will have in the UK is similar to the problem he has in Croatia: his work ethic is poor, to put it charitably. Without people to depend on for the bulk of the work that goes into producing content, he is easily overwhelmed.
But that just leads to the other problems he has: his warped views on sexuality and his use of his 'damaged sexuality' as a weapon. His massive ego and his need to be the most important person in the room at all times. His domineering personality when dealing with anyone who is working with/for him or trying to help him. His dishonesty and gaslighting of others, especially when they express concern over his misbehavior or other problems. And so on. He is the biggest obstacle that he has.