The Defence Secretary has intervened to stop “health and safety killjoys” from silencing Edinburgh Castle’s historic One O’clock Gun. The last firing of the artillery piece was scheduled for 1pm on Easter Saturday, following concerns about the noise from the 155mm field gun. A safety notice was issued after initial noise trials were conducted by the Army Environmental Noise Team – in keeping with health and safety guidance. Historic Environment Scotland, who manage crowds at the Castle, had concerns about handling the number of people who would be there to watch the firing, particularly from E…