I did a search on this, and found a page from a website devoted to kids health. It has a section on what to do when parents’ fighting goes too far:
When Parents’ Fighting Goes Too Far
When parents argue, there can be too much yelling and screaming, name calling, and too many unkind things said. Even though many parents may do this, it’s never OK to treat people in your family with disrespect, use unkind words, or yell and scream at them.
Sometimes parents’ fighting may go too far, and include pushing and shoving, throwing things, or hitting. These things are never OK. When parents’ fights get physical in these ways, the parents need to learn to get their anger under control. They might need the help of another adult to do this.
Kids who live in families where the fighting goes too far can let someone know what’s going on. Talking to other relatives, a teacher, a school counselor, or any adult you trust about the fighting can be important.
More Resources (both US and English)
These are some contact points in England for those in your situation:
WebMD talks about how harmful this kind of fighting is for kids.
Some resources and advice for kids in your situation.
In England, The Women’s Aid Center has information, and can probably advice you about what to do. There is a reference to English law about this issue:
What’s the legal definition of a child “at risk” in relation to domestic violence?
Children living in households where domestic violence is happening are now identified as “at risk” under the Adoption and Children Act 2002. From 31 January 2005, Section 120 of this act extended the legal definition of harming children to include harm suffered by seeing or hearing ill treatment of others. This would include witnessing domestic abuse
From 31 January 2005, Section 120 of the Adoption and Children Act 2002 came into force, which extends the legal definition of harming children to include harm suffered by seeing or hearing ill treatment of others, especially in the home. See a complete overview of protection from domestic violence under civil law.
If you or a friend need help
Contact the freephone 24 hour National Domestic Violence Helpline
run in partnership between Women’s Aid and Refuge
CALL: 0808 2000 247 0808 2000 247
EMAIL: helpline@womensaid.org.uk*
Please note we can not respond to emails by telephone as safety may be compromised. If you wish to speak to somebody please call the number above.
Read questions and answers about the Helpline
*We will respond to your email within 3 working days. The National Domestic Violence Helpline can only offer limited information by email as we don’t have the resources to provide in-depth information in this way. If you require an urgent response or need in-depth support please contact the Helpline on 0808 2000 247. When you email us it’s very important that you specify when and if it’s safe to respond and to which email address (please note we can not reply to emails by telephone). Your safety is our main concern.