South Bound
If you read the transcript of the HOL debate you will note that Lord Guthrie made his speech at 9:53PM and that Lord Chalfont made the final speech at 0021AM the following morning before the vote.
May I suggest that you read the speech by Lord Glenarther made at 1037PM. He is a former British Army and British Airways Helicopter Pilot, Chairman of the British Helicopter Advisory Board, Chairman of the European Helicopter Association and Chairman of the International Federation of Helicopter Associations.