It is possible to extricate yourself from the situation,but you would need to manage several proceedings at the family court ( custody,relocation,maintenance, dissolution of marriage ) and get appropriate and experienced specialist legal representation in Israel.
If you are a normative mother, and your children are under 6, and you have been the children's primary caregiver since birth,your chances of getting custody are very high. Gaining sole custody is a necessary stepping stone to gaining court permission to leave Israel legally with the children, and raise them abroad, if the father objects. To help the court decide whether a mother with custody should be allowed to relocate overseas with children, it normally appoints experts (social worker and clinical psychologist) to make reports and recommendations. Ultimately, the court will have to decide whether you raising the children overseas is the best option for them,in all the circumstances, even if their father objects.
This process can take time, but with proper representation, you should be able to get temporary custody and financial support for yourself and the children (temporary maintenance), that would allow you to live separately from your husband during the proceedings.
Our law practice has successfully represented mothers in similar situations,but it is important that you get appropriate legal advice on strategy and tactics,about how to co-ordinate and manage the various issues and legal proceedings. If legal pressure is put on your husband, it is possible that a comprehensive divorce agreement could be reached that deals with all the relevant issues but, most importantly,allows you to relocate with the children, while guaranteeing him visitation in Israel and the U.K., and ongoing phone and Skype contact.