 The Vigilant T1 variant was introduced into service in 1991, replacing the Slingsby Venture, and was used by Volunteer Gliding Squadrons (VGS) around the UK to train Air Training Corps and Combined Cadet Force cadets in basic flying with the aim of bringing them to a standard where they are able to fly solo.The initial order for 53 was topped up by aircraft bought in the private market.The Vigilant was also used by the Royal Air Force Central Gliding School, at RAF Syerston in Nottinghamshire, which trains VGS instructors as well as providing standards checking, syllabus development and engineering support.