Xavier is the Principal of Musical Theatre Masterclass, a training school for musical theatre students which aims to aid them in gaining acceptance to professional training colleges. The school runs every Sunday, based at the Umbrella Rooms in the West End. Teachers include Anna Tringham (Head of Acting), Ross Sharkey (Head of Singing), Lucinda Lawrence (Head of Dance) and Lucas James (Dance Assistant). Students are also taught by performers and practitioners including Kerry Ellis, Ramin Karimloo, Rebecca Trehearn, Marc Antolin, Robbie Sherman, Katie Brayben and Matt Henry. The students are often given an opportunity to perform at various charity and West End events at which Xavier also appears. The students also appear at a Christmas concert at St Paul's, Covent Garden, alongside industry professionals. The 2016 concert was hosted by Rufus Hound.