A primary school has introduced a ban on whistles on the grounds that the “aggressive” noise can scare children.
St Monica’s Catholic Primary School in Milton Keynes has said instead of using whistles at the end of playtime, staff must raise their hands to tell pupils when it’s time to stop.
Hmm - hand waving - there is something horribly appropriate about that.
However, I suggest installing a small playground cannon instead of a whistle. The noise will be similar to the sound effects in many of the little mites' computer games so they won't be unduly disturbed unless they are playing around it during discharge. This problem could be resolved by reducing the amount of gunpowder to a bare minimum. Obviously a cannon ball would be omitted due to modern sensibilities.