The Deputy Children's Commissioner Sue Berelowitz has countered criticism of her report on child sexual exploitation describing it as "calm" and "measured".
She also said there was a risk of too much attention being given to high-profile cases involving Pakistani men.
She said this was just one of many models of exploitation and that data on the ethnicity of perpetrators only exists in six out of 10 cases.
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German news agency dpa reported that prosecutors decided to seek Mr Stadler’s arrest due to fears he might try to evade justice.
David Dimbleby is stepping down after 25 years presenting the BBC show.
British Transport Police (BTP) were called to Loughborough Junction station in south London at 7.30am on Monday.