"I would probably say the Ireland game is more mental than physical because we have never been in this position before, whereby we can push even further on", number eight Vunipola told British media.
"As an Australian I think the English are very polite and reserved".
Jones' team has closed the gap to the Kiwis at the top of the International Rugby Board rankings and will collect back-to-back Six Nations grand slams with victory over the Irish.
"From our point of view, we have a huge opportunity on St Patrick's Day and for us it's about looking to rectify some of the areas of our game that we haven't been happy with over the past few weeks and if we can make those small changes, then Friday evening's game should be a great one".
"We have got options there to kick the ball, and as a forward seeing a ball go downfield and you're getting territory is sometimes a boost as well". Otherwise Jones will select from a fully fit squad. However Ireland will still be highly motivated to beat England as the visitors attempt to win a Grand Slam and extend their record sequence of global victories to nineteen. It's a childhood dream.
"There are more conversations that can be had and the players can be more involved in that", he said.
"Our mindset was on this weekend but every time we come back here after a game we go down to the bar. Everything would need to go our way for us to win". In those days there were no tactical substitutions so I didn't play a part in any of the games, but I was proud to have been involved in the Grand Slam-winning campaign.
"Next week is about the Grand Slam and we are going to focus very closely on that", Jones said.
Upon dispatching Scotland, the squad gathered with their families at their training base, but the champagne was put on ice as Jones reflected on the jitters evident at the same stage a year ago. We haven't got anything to celebrate yet. "It is all ahead of us", Jones said.
"Last year it kind of took us by surprise". It is a big occasion.
This Saturday they will be aiming to double up with a second Grand Slam win.
In a frustrating quirk of the global fixture list, the game's top two teams are being kept apart until nex year when they will play at Twickenham.
5 - players to have started all nine of England's games this season and last - captain Dylan Hartley, front-row colleague Cole, George Ford and Owen Farrell at 10 and 12 and full-back Mike Brown.