This figure is up 900,000 on the first special, which aired on Christmas night, and is likely to make the show one of the most-watched programmes of the whole of 2007.
The hour-long show attracted 45 per cent of the total viewing audience, who saw Dawn French's reverend Geraldine Granger finally get married.
Its ratings are close to the most-watched non-sports programme of 2006: an episode of Coronation Street from March which was seen by 12.5 million.
Overnight figures also show that Monty Python’s Life Of Brian remains popular, attracting 2.2 million viewers to Channel 4. A documentary about the controversial film was seen by 1.7 million, and a later show about What the Pythons Did Next, was watched by 1.2 million.
