There are a few ex Trident drivers around who may know. I've only flown the DH Chipmunk and Beaver. I always thought that "The Westcott Snatch" was a term of endearment however others may know better.
The main gear use as a second stage airbrake was rated up to 300kts however it was deleted after the aircraft entered service. I understand somebody tried to land one with the nose gear retracted.