Leaving an abusive relationship UK

I've finally decided to leave my partner after being hit in front of my 2 babies (14 months and 5 weeks old) for the 3rd time.

I live in the UK and need to get out of the house ASAP. The plan is to relocate to my mom (only family I have here) who is 3 hours away.

Does anyone know how i can move my stuff there cheaply?

Can he stop me from going?

Has anyone been through this before and can offer ANY advice?

Thank you ladies