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Good afternoon, to travel with your kids if you are planning to reside in U.K. you would need to provide documents such as birth certificates and you have permission to travel such as a court order with sole responsibility of the children.
If you are planning a on visit then you would just need to show you have funds for your visit. Also a letter from school confirming they are able to come for an informal visit.
Under these circumstances if you are in danger or face persecution in your home country you can make an asylum claim in U.K. at the airport. You would need to buy ticket to U.K. and have valid passport then when you get to the airport inform them you wish to make an asylum claim.
Sorry to hear these circumstances. You can travel with kids as long as they have a passport then you can flee safely.
You do not need your husbands consent for visit visa to the U.K.