Hi
@NJS! I think discussing your vacation schemes experiences is a great way to improve on you previous answers. I think too many people are weary of talking about their past VS experience because they are afraid that it is a bad look that they failed to convert. However, as recruiters are well aware, there are many factors going into the final outcome of a vacation scheme beyond performance, and at any rate, by simply getting there you have demonstrated to be an exceptionally strong candidate.
As such, I do not only think there is no issue with discussing a prior VS. I think
not discussing it would be a significant mistake. Mentioning these VS experiences will make many recruiters take your application a lot more seriously and will likely substantial increase your chances of progressing. From personal experience I can also say this holds true. A friend of mine who had done a couple of vacation schemes and was unsuccessful discussed them in their new applications and saw a significantly better AC invite/application ratio when compared to the previous cycle.