The bbc has an article mentioning that:
A passenger aircraft had a narrow miss with an unidentified object over Glasgow, a report has revealed.
The pilot of the aircraft said the risk of collision with the object, which did not show up on radar, had been “high”.
Also from news.com.au it mentions Airbus comes close to crashing with ufo over Glasgow .
the Sun has Passenger plane seconds away from collision with UFO .
There are quite a few reports from the media worldwide about this event, which took place on 2nd December 2012, many of which are just repeating the same information.
Not sure what to make of this sighting, however for now it is definately a UFO (it would help if we knew what type of radar was being used though-i believe there is both primary and secondary radar). Hope certain media do not try to hype this up too much, but i will not be holding my breath.
UPDATE the daily mail has slightly more information here .
The incident happened on December 2 last year over Baillieston, 13 miles east of Glasgow Airport, at around 3500ft.