The deadline for entries is 31 Oct 2012 so you have plenty of time to write your epic.
From The Poetry Society Website:
"Established in 1978, the Poetry Society’s National Poetry Competition is one of the world’s biggest and most prestigious poetry contests. Winners include both established and emerging poets, and for many the prize has proved an important career milestone. Win, and add your name to a roll-call that includes the current UK Poet Laureate Carol Ann Duffy, Tony Harrison, Ruth Padel, Philip Gross and Jo Shapcott. Read poems by previous winners of the National Poetry Competition.
The National Poetry Competition is organised by the Poetry Society...representing poetry both nationally and internationally... "