Did anyone else see the mystery objects in the sky on Saturday evening, between 10.30pm and 10.45pm?

I live near the top of Old Tiverton Road. At 10.30pm I went outside. Looking up towards the west I saw a red light coming towards me just below the cloud.

I thought it was an aircraft approaching Exeter Airport. As it passed overhead there was no sound, which is strange. Then, looking back in the direction it came from, two more lights appeared. They flew overhead and disappeared towards the east, as more lights appeared. Within the space of 15 minutes there must have been 20 lights. The lights traveled randomly - but all in the same direction - on a straight course, except two that altered direction rapidly, but later resumed the same course as the others.

I don't believe in UFOs, but can anyone explain this?