He has played the roles of Nemorino in L'elisir d'amore (Opera South), Rodolfo in La Boheme (Opera Bohemia), Alfredo in La Traviata (Go Opera), Tamino in Die Zauberflote (Dartington Festival Opera), Don Gomez in Die Drei Pintos (UC Opera at the Bloomsbury), Dumain in Verlorene Liebesmüh (Opera Da Camera Linz, Austria), Rinuccio in Gianni Schicchi (Fife Opera), Belfiore in La Finta Giardiniera, Arnalta in L'incoronazione di Poppea, Sellem in The Rake's Progress, La Théière in L'enfant et les sortilèges, Schoolmaster/Mosquito in The Cunning Little Vixen, and Flute in A Midsummer Nights Dream (Royal College of Music).

Other engagements have included the title role in Sir Nigel of Tilford under the baton of Laurence Cummings and a series of operatic recitals across India with soprano Patricia Rozario. Alistair has performed extensively as an oratorio soloist throughout the UK and France, singng in many of the country's finest cathedrals and concert halls.