I first spotted it when I saw it out of the corner of my eye through out conservatory window. It was dusk so you could see fairly clearly. As it was so bright I said to my sun to come and see this plane that is has really bright lights, except it still stayed as a kind of fiery ball shape and that's when I called my husband and we all went out in the garden.
I then went back into the house to get a pair of binoculars and we all stayed upstairs as it was going further away and it was better to see from there.
A real plane did cross its path but we could tell that was a plane as lights were flashing. This is when it weaved and then went behind a thin cloud and then was gone.
It was at 8.40pm and we watched for no more than about 5-7 minutes and we have never noticed a plane on the path it was going in that direction, west to east. As I said, no noise which is first thing I said as I had already heard two helicopters and the plane I just referred to we heard that.
We live in south-east essex, just outside Southend-on-sea which does have an airport. But it wasn't low enough to land there if it was going there.
Can't explain it as definitely wasn't in our minds a plane.
Hope that helps