When I first moved down in 2005 LHR had :
BA005 / 006 NRT B744
BA007 / 008 NRT B744
JL401 / 402 NRT B744
JL403 / 404 NRT B744
JL421 / 422 OSA B744?
BA cancelled the second NRT for a while and re-instated the service to Haneda as 5 per week. JAL now only operates a single NRT, so Japan is still well down over the period.