Detective Superintendent Phil Owen of Greater Manchester Police said he is "very pleased" with the results of the Clare's Law scheme.
Speaking to Daybreak he said: "It's really important that we do learn those lessons.
"The domestic violence disclosure scheme I think is real evidence that we've listened to Clare's father, we've listened too various different organisations and from September last year we've given disclosure in over 50 cases."
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Police have held two men over the death of Inga Maria Hauser in Northern Ireland, 30 years after the murder.
Every train run by the UK’s busiest franchise, Govia Thameslink Railway was rescheduled from Sunday.
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