You certainly can.
Although we have designed this programme to allow CPL holders to apply to an airline and get a job offer BEFORE having to invest in MCC/JOC training, we do not wish to exclude people who may have already taken that step.
This text, pasted from the webpage, explains in more detail:
"This programme is designed to minimise personal risk by offering an opportunity for the highest-calibre cadets to secure airline employment at an earlier stage of training, before investing in MCC training. Pilots who have completed an MCC course previously are welcome to apply, but will still need to complete Phase 2. That's because overseeing your progress through Phase 2 is important in order for Titan Airways to verify your suitability for an airline-funded Type Rating."
Hope that helps.