Could be a balloon but it has the metallic no seams look. Btw. there have been some good CE3 cases around the Manchester, England area. Don't know of any recently though.
I've never heard of any, but I'm not really a researcher into CE3's, M.A.P.I.T (Manchester's Association of Paranormal Investigation & Training) has some nice pics on its website and some research notes http://www.mapit.kk5...aphs/4535375369