I've seen fears expressed here before that new trans policies in schools will marginalise religious girls, and this blog seems to confirm this - girls will be removed from PE with the new rules in Glamorgan.
The fourth witness, a councillor, appears to put it best - the feelings of the boys who self identify as girls will be prioritised over the safety of the girls. It's the girls who will be asked to leave if they object to this new policy.
penarthnews.wordpress.com/2018/06/14/muslim-parents-and-others-object-to-vale-councils-controversial-transgender-toolkit/