At Heathrow I suggested that my trainees consider the impact of their transmissions from other viewpoints. 09R was a case in point to 'keep the traffic moving' where there may have been a fresh queue to arrive at the hold especially from the southside where it was a long way from the stop-bar. A conditional may have been no longer applicable but the mention of the runway designator may have caused some consternation to landing traffic over the threshold so just the phrase 'Line Up' was used. It was permitted in those days in between permitted phraseologies 'Line up and hold' (= 'Roger, Line up and roll') and 'Line up and wait' (='Roger, Line up one eight'). It would seem that the option to transmit a short, punchy 'line up' without a runway designator is no longer permissible so we get embroiled in the time-wasting discussion 'do you mean after the one just touching down or is there another one?'. In those days we could get away with being sensibly inventive to 'keep the traffic moving', we had some wonderful, memorable characters eg. JK and IMC ("come rahnd the corner, power up on the brakes and release 'em when I tell yer....."). There once was a 'records' board in the 6th floor SBU with some ATCOs' achievements eg. JK and his record for 'the most aircraft cleared for take-off at any one time........' Maybe HD can remember some of the others...........