I am shocked...
How the h... can you people say that the use of conditional clearances not have lead to any problems?? As an air traffic controller for nearly 20 years and the leader of my airports local runway safety team (LRST) i am SO aware of why more and more airports stop using that type of clearances! Do you "best-in-the-world-pilots" really believe that the use of such clearances are stopped for no reason?? Read the incident rapport from Munich from some years back in time and maybe even you will understand that there is so much safety to win and so little efficiency to loose, that the stop in using conditional clearances is purely positive for the safety!
You guys should really be more worried about safety than being angry for being held at a holding point until the preceeding traffic has landed... I do hope your attitudes do NOT represent the majority of pilots in UK!!