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The ban will affect people in north-west England but other firms say they have no plans to follow suit.
A minister quits as MPs back amendments tabled by Brexiteers by just three votes.
Some toys have high levels of boron, which can cause vomiting and impair fertility, a consumer group warns.
An independent inquiry gives go-ahead to genetically altering human embryos, but advises caution.
But PwC warns there will be "winners and losers" with many roles set to change.