Traveling east to west, cigar shaped, impression of great speed not consitante with time taken to travel distance.

Seen by my mother & myself in the conuty of Essex in UK. It moved from east to west quite low on the horizon. The time/speed it took to cross our vision (which was limited by trees on both sides of the lane where we were walking) was slow but at the same time made me feel it ws moving very very fast. It was much too close and too slow for an aeroplane which I was used to seeing as there were many airbases in that area.  The colour was milky with a tail which remained the same size all the time.
Although some years ago now I can still picture it and especialy remember the strange sensation of very fast movement which was out of context with the time it took to move across the sky. Some years later I spoke to a neighbour who told me she had also seen something round about the same time and date.
Date is approximate.  PD