The positive vibe around the Black Caps heading the tournament led to his pledge, Mr Thompson said.
Peter's marathon trip (app users tap here)
"I got on WhatsApp with my Aussie mate Tom who lives in Melbourne and made a pact with him saying if it is an Aus-NZ final and you can get tickets, count me in."
Although Australia's presence in the final has yet to be confirmed, Mr Thompson decided he wasn't going to miss the match, regardless of who the Black Caps play.
"After the semi-final and the emotion of the way that happened there was no way I was going to miss out on the opportunity to go."
Mr Thompson was at his job with an English pensions company during the final stages of the semi-final win over South Africa so "watched" the result unfold through ball-by-ball online scoring on his computer.
"When that final comment came up and said SIX! in bold I just leaped out of my chair and ran into a meeting room and was jumping up and down. I was in there for about 30 seconds then I composed myself and went back to work."
His biggest fear, he says, is falling asleep at the match.
"If I fall asleep for 10 minutes or so when Brendon McCullum is batting, he will have scored 70 and got out. So I'll definitely make sure I am awake when he comes to the crease."