Semi-circular, semi transparent denser at the 'front'. An orange triangular light was at the 'rear'.

Slow movement, but changed course from heading north to east.

Object was a semi transparant white much denser at the 'front' with what appeared to be an orange light on the 'rear' triangular shape. I was on Sleaford road Boston, lincolshire, UK, at the ASDA traffic lights, facing town in my vehicle. I glanced up and saw this slow moving object traveling from south to north. At first I thought it was a firework but then realised it was lasting to long. It then took a slow turn/ bank to it's right and started to head easterly until I could no longer see it for the buildings. It appeared to stay at the same height during my sighting which I can only describe as high cloud height, on saying this the orange light was very intense and looked closer although at the same time attached to the object. The sky was clear and the area/town was quite busy so i'm sure other people must have seen it. The sighting was around 17.00.