I would have to agree with In Oban. The ammount of long haul taffic from the reigons of the UK using LHR has dropped over the last say 15 years, and continues to drain away. It is not just that LHR is not the best place to transit for some, but it is also served by BA which is no longer the go to carrier for every Brit going long haul, and especially if going East. The ME3 have put paid to that, and LH/AF/KLM are doing the same on other routes if you are not SE UK based.