Thanks for the replies. That's most informative. I've scanned various threads and articles about concerns with regard to wake turbulence and It got me thinking afterwards.
In a similar vein, I saw an amusing example of movement in the lounge at LGW. There were about six aircraft all waiting their turn in that wonderfully complex array of turn-offs near the threshold. Suddenly, a BA 737 appeared moving at a fair trot and swung round onto the runway at the entry point - in front of an aircraft that was already lined up on the runway. Someone remarked "Look at that little bugger - he's cut them all up!". I wondered what it was like for the a/c behind - he must have got a fair old rumble from the exhausts.
It's a testament to the people that coordinate all this - it just had me in awe. That and the two different lanes of taxiing traffic at the end of 26L, with several ways onto the rwy. It must be equally fun for the crews
