I was in Thornes Park, Wakefield walking home from a friends house. I was looking to see if I could see the Perseid meteor shower when I saw a strange light in the east. I first thought it was a plane but the object made a turn to the north and I saw another light behind it. The lights then turned to the south and made this pattern as they flew closer to my location. As they flew over my I saw that they were large in size (about three football pitches) each. The bottom of each craft had pulsating lights of various colours (red, blue yellow). The crafts continued in a zigzag (north to south) as they flew westwards.I felt uneasy when I saw the size of the crafts as I knew they couldn't be man made.I lost sight of the crafts when they flew over the horizon.