British Airways is offering London early bird fares from $1999 on it's special offers page. You can bookmark this page to access BA's special offers page as they keep on updating offers.
For the London offer, you have to book before 19 December 2008 for departures 1 April - 30 November 2009.
For the London offer, you have to book before 19 December 2008 for departures 1 April - 30 November 2009.