A long time ago in BCAL days we often used the easterly runway to start our trip to South America via Lisbon or Madrid. As we only had fuel for to the first stop so we were very light. The stop ht at LGW was 2000ft and if the auto throttles were engaged ihe aircraft reached 2000 ft in a few seconds and then the thottles woud close. Very scary for the pax as we became a glider for a short while. We soon learnt to use some manual skills to make for a more relaxing departure.