The Metropolitan Police confirm a man is in custody over allegations dating back to the 2000s.
The foreign secretary says the proposed legislation would make changes to the Protocol to resolve the "grave situation".
The ex-footballer gave evidence on day six of his wife Coleen's libel case brought by Rebekah Vardy.
Abuse allegations were made months before her husband poured petrol on her and set her alight.
Laura Castle shook Leiland-James Corkill to death after she "lost it" over his crying, a jury heard.