Ok, so this took some working out to figure out who this was. It is not, as I previously thought, Alex Goode. Alex is in fact the kidnapper, not the kidnappee. If you watch the film you realise that the character is actually the narrator of the story. The cast list has him named as Brendan Murphy.
So, what is going here? Well Jimmy (Alex Good) has kidnapped the narrator (he has no other name) and sets fire to him. Does he die? You'll have to watch till the end!