Flannan was originally born in Ireland, but was brought up the UK. He completed his training at RaAW School of Theatre & Film and has appeared on stage in an original production of "Endurance: Through their Eyes" at the Tristan Bates Theatre. He has previously performed at The Tricycle Theatre, The Park Theatre and Camden Community Theatre along with several Pantomime runs.
For Proforca Creative, Flannan originated the role of "Matt" in "If I Go" (May 2016). Other credits include "Dr Von Whackoff" in "Saucy Jack & the Space Vixens (Nov 2016)
Flannan is also a huge fan of Shakespeare's classical work and looks forward to one day playing a lead in any one of his plays.