Yes, you are probably right. It did sound like that. I'll try to get a better photos at the weekend.
Found a video I recorded, it does a screech at around 4 seconds into the video, very windy so most of the noise is wind.
I went to my garage the other night and under the floodlight I saw something lizard like on the ground. When I bent down to look, it was a little newt. I took this picture of it. He's quite well camouflaged on the mossy concrete, but you can cleary see his eyes. He didn't move all the time I was looking so I thought he was dead. But he was gone next morning. I've had this happen before in our garden. He may have been eaten by something but apparently they often play dead if seen! lol