I found this on the SaveLives site:
Key statistics about domestic abuse in England and Wales
Each year around 2.1m people suffer some form of domestic abuse - 1.4 million women (8.5% of the population) and 700,000 men (4.5% of the population) 2
Each year more than 100,000 people in the UK are at high and imminent risk of being murdered or seriously injured as a result of domestic abuse 3
Women are much more likely than men to be the victims of high risk or severe domestic abuse: 95% of those going to Marac or accessing an Idva service are women 4,
In 2013-14 the police recorded 887,000 domestic abuse incidents in England and Wales 2
Seven women a month are killed by a current or former partner in England and Wales 2
130,000 children live in homes where there is high-risk domestic abuse 3
62% of children living with domestic abuse are directly harmed by the perpetrator of the abuse, in addition to the harm caused by witnessing the abuse of others 1
On average high-risk victims live with domestic abuse for 2.6 years before getting help4
85% of victims sought help five times on average from professionals in the year before they got effective help to stop the abuse
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There is plenty more information. The thing with children is that they often don't report abuse.