Long taxi and holding at LHR normal...won't really change with extra runways, terminals etc, more capacity will mean more passengers can be pushed through the airport. When T5 opens and gets over its inevitable teething problems, it will be lovely to pass through, out to the still congested taxiways and runways! After a little while, more and more passengers will be travelling through T5 and it will be as congested as T4 and T3 is now. There probabaly will still be a shortage of BAA security staff so will still be long delays for that.!!!