The following account is from UFO Magic in Motion (1979) by Arthur Shuttlewood.
A much valued UFO friend is violinist music-teacher Christopher Trubridge of 83 Portway, Warminster. With a Praktica Super TL2 camera equipped with a telephoto lens f: 200mm 1:35.5 and using 400 ASA — Din. black and white high-speed film, he took several 'shots' at 10.11 a.m. on Sunday 3 April 1977. Weather conditions were good, clear, with only a few wisps of cloud fouling parts of the sunny sky. The wind was westerly, direction of aeroform NE to SW. Location? Warminster, on a small road off the main Westbury highway leading to the local village of Upton Scudamore. This is a mile and a half from our town. At the time of the sighting, the sun was slightly obscured by drifting cloud. The UFO passed low overhead and was very large in dimension; first appearing as a round ball-shape and, growing closer, seeming to change shape in strange whirling motion to a cylindrical or cigar-form.
Chris, who felt a sharp tingling on exposed flesh as the giant structure was above him, said: "It was absolutely huge as it passed overhead. I had difficulty in keeping the object in the eye of the camera lens as it seemed to give off a hazy effect. As it continued on its flight path SW it seemed to have developed like the end-on view my pictures show, after turning. This grew very large for a short while, then began to diminish very quickly until I became momentarily blinded from looking at the object so intently into the glare of the sky."
Mr. Trubridge has been a keen Ufologist for several years at Warminster and had taken scores of photos of UFOs previously — in vain. All failed to show more than mere indeterminate smudges which would convince no one. So he is thrilled to have 'made it' at long last! Others who have seen similar type phenomena on our noted hills include John, Ella and Maureen Rowston; Neil and Sally Pike (daughter of a former Det. Chief Superintendent in the Wiltshire Constabulary); Annabella and John Plowman (trades council officers both); Barry and Judy Gooding, Reg and Sue Skrine (Trowbridge), Sue and Tony Justice (Winchester), Dr. John Cleary-Baker (for 12 years editor of BUFORA Journal); police and service personnel; and bevies of school children, parents and teaching staff in the area. Chief Insp. Maurice Petty, Warminster Police, attests freely to a number of UFO incidents reported by motorists encountering the 'spectacular unknown' in the skies and duly logged in police records locally. Truth cannot be stifled . . . Douglas Chaundy and wife Jenny from Weston-super-Mare are other reliable witnesses among thousands worldwide who have seen flying mysteries at Warminster, since their modern-times advent on Christmas Day 1964.