One source close to the event said bringing the show forward in the calendar from its traditional October date was believed to be integral to the new show concept, and added that the new format was likely to focus on design.
Last year's event was dropped after it failed to win support from the car industry, despite efforts by Clarion and design agency Work to develop a revised feature-led format to save the show (Marketing Event, May).
Clarion has since held ongoing talks with the motor industry and leading manufacturers about the direction of the event.
Show director Carsten Holm said: "The cancellation of the 2001 show was a blessing in disguise because it gave us breathing space to find out what was wrong with it. We realised quickly that the old format was not what the industry required, and the industry agreed."
He added: "The days of the traditional October London Motor Show are over. We have had the opportunity to develop a more focused event for 2003 that will reflect the needs of the UK car industry. We are confident that the relaunch will be a success."
Details of the new show format are expected to be revealed later in the month.
The London Motor Show was last held at Earls Court in October 1999. About 360,000 visitors attended the 12-day event.