Spotted from M25 near Great Warley, UK

For context, I was a passenger in the car on the M25 on the way home from seeing family when this caught my eye.

Seemed kind of weird to me – I’ve seen a lot of ‘odd’ stuff, but this is the first time I’ve managed to catch something on camera. At first, I thought it was a balloon, but the way it was moving was just really odd?

Rotating/spinning, but wobbling at the same time on a horizontal trajectory. Any ideas?

I have a longer video, but sadly my camera wanted to focus on the rain drops on the sun roof as apposed to the thing, but I may be able to retrieve dash cam footage too!