I stumbled across another rather mundane possible explanation for some of the “orb” UFOs at www.rense.com. They’ve got video footage of a daylight UFO and among other things considered in their arm chair analysis was a special type of weather balloon.
It occurs to me looking at this that the metallic silver color would reflect the sky brightness and color making it relatively invisible. The spiky things, from a distance too far to resolve, might give it a fuzzy appearance.
Still, I don’t think it’s what’s being seen in Surrey because those are bright in the infrared. And here, the degree of blur was too much to be explained even by the spikes. Still this puppy has definite UFO potential.