Denis Cliffe eh?
Knew him at EGLL when I was an ATCA.....then again briefly at EGPF when he was my trainee. But he departed suddenly, and I was never sure what happened to him.
Speaking of slow climbers, I distinctly remember seing a strip for a Pan Am 707 to San Francisco...I wrote the Sid on the strip and thinking it a bit of a stretch, pointed it out to GMP. When the a/c called for start, he queried the destination, and got the reply " We`re Pan Am, we can go anywhere".
Everyone in the tower stopped what they were doing to watch it depart, it took up a lot of runway.