Probably a British embarasment at having to get it 'up' twice instead of lasting twice as...

*insert needle scratch sound here*

Given the brit's fixation on 'its not just there for looks'; probably because it a) lifts the hot air further out of the glideslope, and b) provides a better platform for the LSO's than being right down there on the fantail and having to dive into the damn nets on a bad approach?

(or, I could just be 'Full of fertilizer'!!!!)