The Royal Navy used to have a Wessex 5 (XT764/P-T if my memory serves me right) that belonged to their Presentation Team that went around to schools in the mid-70s. They used to fly in and shut down, give a presentation about life in the RN and then let everyone look over the aircraft. It then took off and did a display before disappearing.
It came to my school in Maidenhead a couple of times and the playing fields were in the middle of a housing estate! Can you imagine the uproar these days if they did something like that from all the anti-aviation NIMBYs?!!