Was Nick Clegg on Flight 7775 with Chris Huhne?
UPDATE AT 1652BST:
A spokesman for Nick Clegg has just told me that he "would not have been on the plane" - Ryanair flight 7775 on 12 March 2003.
The spokesman tells me that during the weeks that the European Parliament sat in Strasbourg rather than Brussels, Mr Clegg's routine was to travel back to Brussels where the Clegg family had a home, and then, if necessary, fly to London.
ENTRY FROM 1216BST:
Was Nick Clegg on Ryanair flight 7775 from Strasbourg to Stansted on the evening of 12 March 2003?
That's the flight under focus in the controversy over whether Chris Huhne got his then wife, Vicky Pryce, to take points for him on an alleged speeding offence on the M11 in Essex.
We know Mr Huhne was in the European Parliament that day, but didn't sign in the following day, Thursday 13 March 2003.
Mr Clegg, too, who was then an MEP, also attended the Strasbourg Parliament on the Wednesday, and voted at lunchtime, but didn't sign on there on the Thursday. Just like Chris Huhne.
So Mr Clegg, too, may have taken the late evening Ryanair flight 7775 from Strasbourg to Stansted.
So it's conceivable that Mr Clegg may recall whether Mr Huhne was on the flight too, or have some record of it.
On another matter relating to the flight, there's a newspaper report today saying that the UKIP leader Nigel Farage claims that both he and Chris Huhne were on Ryanair 7775 on the evening of Wednesday 12 March 2003.
This newspaper report doesn't tally with what Nigel Farage has told Newsnight.
On Monday Mr Farage told me that the late evening Ryanair flight to Stansted was regularly used by English MEPs when the European Parliament was sitting in Strasbourg in those days. It was not only convenient, but cheap.
And, he said, the Civil Aviation Authority (CAA) even supplied MEPs with free passes for the short-term car-park, right next to the terminal building at Stansted (worth £31.50 a day at 2011 prices).
When I first spoke to Mr Farage on Monday he reckoned he himself might have taken that flight that night, and he also recalled that Mr Huhne regularly took it too.
Mr Farage then went home, and went up to his loft and looked through his archives on Newsnight's behalf, and found that he - Farage - did in fact take flight 7775 on the night of 12 March 2003.
His paperwork shows the plane was scheduled to leave Strasbourg at 22.25 French time, and arrive at Stansted at 22.55 British time.
The CAA have told Newsnight that it arrived, in fact, at 22.23, which was half an hour early.
But when I spoke to him yesterday Nigel Farage couldn't recall - quite understandably - whether or not Chris Huhne was definitely on the flight too.
He just thought it was quite likely, especially if Chris Huhne wasn't at the European Parliament the following day.