Top lawyers said it was not up to parliament to decide how a judge should rule in a case. Geoffrey Robertson QC said in The Telegraph:
The government cannot predetermine the results of individual cases which all depend on careful and compassionate assessment of very different facts.
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The plans had been in development since 2014, but would help underline Britain as a "global player" following the Brexit result.
The number of calls about children suffering or witnessing emotional abuse or physical violence in the home has surged in recent years.
The curtain will come down on the show for the final time at the Piccadilly Theatre in March next year, before embarking on a UK tour.