I'm not sure that by removing the material on line that means the policy itself has been removed.
That
uncertainty is entirely sensible.
I can't claim knowledge of the bureaucratic environment of the U.K., but if it's similar enough to that of the the U.S.A., I'd expect that the legal
form or
matter that's actually required of each charity or school would be
filing the
policy with whatever government organization legally requires such a policy to exist. If the government organization acknowledges--or would acknowledge if doubts were raised [†]--that the policy has been filed, then any means of publication, including accessibility
on line would be
legally optional. So the presence or absence of such policy on line would
not be a reliable or trustworthy evidence of whether it were still in effect at the charity or school in question.
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Note †: At least somewhat analogous to
filing an annual
tax return with the U.S. Internal Revenue "Service", in this sense: If one completes all the required forms with the proper care, and presents it to the U.S. Postal Service by the applicable deadline, one needn't worry about whether the
return was
filed, or whether the IRS
received it.