Hey - just wanted to offer my thoughts on this. Congrats on securing a TC!
I would simply say that even if you are contractually permitted to complete a VS, or multiple schemes, after signing a TC, I would think twice before doing so. Securing a VS is a remarkable achievement, however, many deeply diligent, intelligent and qualified candidates are unable to do so because of the very, very fierce competition. Clearly, many people are desperate to break into a firm via a VS.
I would consider politely declining a VS when holding a TC, to allow another deserving person a chance to enter the profession, as I, and am sure others on this forum have done. Hope all goes well!