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someone already added that this "traffic light" policy is NOT required; the school is free to write their own
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Thanks, but I don't think this addresses the specific question.
The link provided by JmJ2cents only talks in general terms about charities. Now although the SSPX in Britain is a charity, the school itself is a registered private school, they have regular inspections from the school authorities. So the question remains, are there any specific legal requirements that a registered school must comply with?
Yesterday in England there was a row over parents removing their son from a "faith" school (C of E) due to another boy being allow to wear a dress (
http://www.bbc.co.uk/news/uk-england-hampshire-41224146). The school's defence was that they are required by law to allow this (I don't know if this is true).
Perhaps JmJ2cents' friend can be more specific. Also, I'm not sure that by removing the material on line that means the policy itself has been removed.