Speaking in 1999 he said: "And really what it was, was a reflection of the bolts in the windows.

"The windows were made up of about three or four or five panes of glass, so that if one got broken we still had some pressure integrity.

"And these little things, when the Sun shined on them right, they’d multiply the images off the different panes. And I’m quite sure that that’s what this thing was."