Last night on Newsnight, Dean Godson of the think tank Policy Exchange accused me personally (watch it here) of making a "disastrous editorial misjudgement" and of "appalling stewardship of Newsnight". I think I should respond to that.
Mr Godson was responding to Richard Watson's investigation (watch it here) into Policy Exchange's recent report - entitled "The Hijacking of British Islam" - which accused several leading mosques of selling extremist literature.
In October Newsnight had been due to run an exclusive report on the findings and Policy Exchange had given us the receipts to corroborate their claim that a quarter of the 100 mosques their researchers had visited were selling hate literature.
On the planned day of broadcast our reporter Richard Watson came to me and said he had a problem. He had put the claim and shown a receipt to one of the mosques mentioned in the report - The Muslim Cultural Heritage Centre in London. They had immediately denied selling the book and said the receipt was not theirs.
We decided to look at the rest of the receipts and quickly identified five of the 25 which looked suspicious. They appeared to have been created on a home computer, rather than printed professionally as you would expect. The printed names and addresses of some of the mosques contained simple errors and two of the receipts purportedly from different mosques appeared to have been written by the same hand.
I spoke to Policy Exchange to try to clear up these discrepancies but in the end I decided not to run the report. This is not because I "bottled" it as Mr Godson suggests, but because I did not have the necessary level of confidence in the evidence presented.
In the days that followed we focused further on the five receipts about which we had concerns and eventually asked a forensic scientist to analyse them. This is what we found.
1. In all five cases the mosques involved said the receipts did not belong to them.
2. The expert analysis showed that all five had been printed on an inkjet printer - suggesting they were created on a PC.
3. The analysis found "strong evidence" that two of the receipts were written by the same person.
4. The analysis found that one of the receipts had been written out while resting on another receipt said to be from a mosque 40 miles away.
Mr Godson says he stands by his report 100%. I also stand by our report 100%. I don't think we can both be right.