I fly out of Redhill and find this sort of thing a tad worrying. I would certainly hope that either the pilot or Redhill tower informed the police? (OK - I'm realistic about the potential response, but it seems like the sensible thing to do).
Also, should any other local flyers or PPrune readers know the owners of the two horses - that wrecked my day's flying on Saturday by wandering round on the airfield causing it to close - please ask them to keep them tied-up better and their fences in good repair!
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"Hersham Boys, Hersham Boys - lace-up boots and corduroys"