Well, one must take into account the pro's and con's of the new LHR 1-stop service.
-Service into Heathrow, with countless connection possibilities
-Direct connection on to BA service to Lagos for all the Oil people, now leaving from LHR
-4 choices of service-FJWY, all in the latest 'edition'
-LHR physically closer to London
To be honest, if I were a businessman, I would take the LHR service; the stop in IAD wouldn't bother me really-I would attach greater importance to connection possibilities, and the fact that the bulk of BA's big business flights operate from there.
Of course, as my company has a business class policy for flights lasting more than 6 hours, I want to try the flat-bed in Club World!