Lewis (ITV1); 8/11: The Conspiracy Files (BBC2): The notes I made while watching Lewis include such random jottings as clubbed to death with a blunt instrument, Dionysus, phone sex, Sons of the Twice Born and adrenochrome.

All of that makes as much sense now as it did at the time. Anyone expecting a fast-moving, easy to work out whodunit from Lewis will be sorely disappointed.

Like its predecessor, Inspector Morse, this is a detective series that delights in perplexing the viewer and blinding them with a plot so complex you need to be one of those Oxford dons that grace the story to have a hope of understanding what's going on.

They do seem to have forgotten to give Robbie Lewis a character. Morse at least had his car and his beer, Lewis has nothing. Just a dead wife. Kevin Whately plays the dogged detective with a look of weariness reflected in the viewer's face by the time the fifth commercial break arrives.

Perhaps, like the rest of us, he's still trying to work out what use is served by his sidekick DS James Hathaway. Perhaps one day, he'll say, "They went that-a-way Hathaway" - ridiculous maybe, but Lewis badly needs an injection of humour amid the bludgeoned corpses, brainy professors and picturesque Oxford locations.

The introductory episode of Lewis attracted 11 million viewers, making it ITV1's highest-rated drama of 2006, so they must be doing something right. If you liked Morse, the chances are you'll like this.

The mysteries at the heart of 9/11: The Conspiracy Files remain unanswered. Some will say they should never be asked, that those questioning official accounts of 9/11 are unpatriotic, stupid or just plain argumentative.

The BBC considered the claims with impartially, presenting both sides of the case and leaving the viewer to make their own conclusions. Given that past events have shown politicians and government law enforcement agencies to be untrustworthy and untruthful, it's hardly surprising that conspiracy theories spring up.

Those presented here ranged from claims that the collapse of the World Trade Centre was a controlled explosion, that United 93 was secretly shot down by the US air force, and that the evidence suggested something smaller than a passenger plane crashed into the Pentagon.

Could the whole 9/11 tragedy really be a plot by the President and his oil rich friends to provoke war in Iran and Iraq as part of a plan for world economic domination? Clips of Nixon and Clinton reminded us that past US leaders haven't always played by the book.

These 9/11 conspiracy theorists aren't just lone voices claiming a cover-up. Groups such as Scholars For 9/11 Truth are determined the truth will be told. Most argue coherently and intelligently, only the odd person comes across as being a paid-up member of the lunatic fringe.

The programme found plenty of people to dismiss their theories. Ironically, one of the writers of The X Files - the TV series that claimed "the truth is out there" - was dragged into the argument. Six months before 9/11, an episode of spin-off series The Lone Gunmen featured a plane being hijacked and flown towards the Twin Towers. As this was fiction, disaster was averted at the last moment. Some have suggested, this was a coded warning about things to come. Even writer Frank Spotnitz denying this won't, I suspect, put paid to this particular conspiracy theory.