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11.20 AM. Dry and fine, blue sky with wispy clouds.

Brian Harry was driving his van east along the M4 with work colleague, Martin. Just as they were approaching Junction 45, at Llansamlet, Brian noticed a pale bronze-green solid saucer-shaped object in the sky, high up, which was clearly visible for a short while. It was at 11 o'clock position and lower than what a jet liner would be at. There was no vapour trail.

There were several jet liners visible at the time, all of which were leaving vapour trails. The object was moving from left to right - in a south-westerly direction on a level path. He watched it as long as he could until it vanished behind clouds.

Martin did not see it as he was on his mobile phone.

Source: SUFON Files. Witness interviewed by Steve Drewson and Emlyn Williams 28 June 2016.