Spherical UFO snapped over Bexwell, Norfolk

On November 27, 2016, a witness was just jogging in Bexwell, Norfolk. He took two pictures of clouds. On it, he discovered a weird spherical UFO

Witness report:

I went for a jog in the Ryston/Bexwell area in Norfolk, on a Sunday morning (November 27th, 2016). I took some photos of some cool clouds, and noticed the sphere in both photos after I got home and looked. The object was not visually present when I took photos, but are clear afterwards. I went back a week later and took more photos. The object appeared again, above tree line, but again, only in the photos. The second set of photos were not backed up and were lost when phone died a few months later.

https://mufoncms.com/cgi-bin/report_handler.pl?req=view_long_desc&id=90180, 11th February 2018