Easyjet have half a million seats on sale for travel between 1 October 2003 and 31 January 2004 inclusive (limited availability on weekend flights and from 18 December to 5 January).
Booking opened early this morning (I can't get on to their site now) and the offer ends at midnight on Monday 1 September 2003.
Limited weekend availability is a shame but there might be some bargains for an early season long weekend.