I noticed a light that dimmed for around 7 seconds multiple times, as it was not a standard airplanes blink I recorded it and this is what I found. At the the frame the object could no longer be seen so I immediately took a three second exposure photo to see if I could spot a drone, and check for clouds interfering with the blink or light but visibility was clear, flight radar showed no flights. It was above coombe abbey in coventry at 21:42.