I can only agree with the contributors who have highlighted that it is hard work being on a VGS especially when you join. At my school we've had problems when taking on adult trainees for a variety of reasons: motivation lacking, underestimating the handling characteristics of the Vigilant compared to a typical "spam can" and a general lack of appreciation of the essence of what the organisation is all about. For the most part they simply haven't coped with it and left after a short time.
By far the best source of new blood are the ever put upon Staff Cadets. These youngsters slog their guts out for little reward but they understand what is required far better than practically all the adults we have tried to train - ex FSCs excepted of course.