The tensions in the for-profit childcare sector have been explored in a parliamentary hearing. Photo: Joel Carrett/AAP PHOTOS

The head of one of Australia's largest childcare providers has defended the safety record of the massive operation he oversees but apologised for harm to children that took place in his centres.

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Challenges facing the heavily scrutinised sector were acknowledged by Affinity Education Group leader Tim Hickey as he fronted a NSW parliamentary inquiry.

Shocking allegations of children being sexually abused, restrained for hours and served low-quality meals at fo

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