From the beginning, your husband decided that he was going to make sure any assets he has, stayed solely in his possession. He's deliberately and systematically made sure that you and the children won't benefit from him at all. That's cold, calculated premeditated and cruel, especially towards his own children.
This may sound an odd question OP, but has your husband benefitted in any way from marrying you? Did your Dad for example fund some of his businesses? Have you given him a large chunk of inherited money? Most people marry because they're in love, your husband, is completely indifferent to you and his children. It's almost as if he's got what he wanted out the relationship and now you're no use to him....this is why I asked the above question.
If your husband has connections to Dubai, you need to make sure that your husband can't take your children out of the UK. If he were to take them to Dubai, and refused to allow them back home, you'd never get the Dubai authorities to enforce the return, as men are favoured.
The above is probably an unlikely scenario, considering the fact your husband is prepared to leave his children, and is refusing to financially support them. However, there's always a possibility, and therefore you need to make sure you put legalities in place to stop him.