Four or five vapour trails seen travelling at high speed through the sky.I saw a white light that resembled a vapour trail heading inland from the sea. There was a full moon and I assumed that I was witnessing an aeroplane flying low. I then realised that it was in fact four or five seperate trails and immediately called my son to witness it.I opened the window and looked out and the white light trails were moving very fast inland leaving a long trail behind them.They were all travelling in a horizontal line in a formation so it would not appear to be debris falling to earth. I went out to the back and looked up in their direction of travel but the lights had dissappeared.I am a retired Police Officer and my son is thirteen years of age so we are definately not going mad!