Rotherham Council leader Roger Stone says the investigation into the decision to remove children from the care of two foster parents who are members of UKIP will ascertain whether "everything has been done professionally."
"We are going to investigate to make sure everything has been done professionally.
If the professionals give advice, we take it. We are going to investigate - we always would if somebody complains."
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The free festival, on Saturday and Sunday, is regarded as one of the UK’s most prestigious festivals.