Strange contrail south of London today
Did anyone else notice a strange vapour trail just south of London UK today around 1150Z? Going from east to west, it formed a continuous sinusoidal shape. Since there were several other trails in the same area of sky at the same time which retained a straight shape, and since the trail itself retained integrity within the wavy shape, its difficult to see how air currents could have been forming its shape. It looked as if it was being made by a single or closely coupled twin engined aircraft that was following a sinusoidal track with a "wavelength" I'd estimate at a mile or so. Unfortunately by the time I noticed it, the aircraft was too far to the west to see.
I've never seen this phenomenon before; anyone any ideas?