Since bursting on to the scene against Scotland at centre to open the 2012 Six Nations, Farrell has made the England No10 shirt his own, despite the likes of Toby Flood and Freddie Burns doing their best to wrestle it from him.
And 364 days since that Red Rose debut, Farrell was back out for England against the same opponent on Saturday, helping lift another Calcutta Cup as he kicked seven of his eight kicks.
This dead-eye accuracy with the boot, as well as his miss-pass to send Geoff Parling galloping away for a try at Twickenham at the weekend, means Farrell’s name is now one of the first on Stuart Lancaster’s team sheet.
But the Saracens man isn’t about to get carried away, adamant that at 21 he still has a lot to learn.
“People seem to talk about me sometimes as if I have made it and have nothing to learn but that couldn’t be further from the truth. I know I am not the finished article by any means,” said Farrell, who is representing the England team for Marriott Hotels & Resorts, Official partner of the RFU.
“You have got to look and focus on what is in front of you and if you take your eye of it you will slip up. There are a lot of good players to come and take your place if you don’t do that.
“You want to be as best prepared as you can be for the next game and that is what I want to be.
“Getting into international rugby and playing in your first games only makes you want to work harder and keep progressing and if you don’t do that you are only going backwards.
“The more big games you play in, the more experience you get and the better you are as a player normally and that is what I am trying to do.”
Such has been Farrell’s meteoric rise that he is already been talked about as a shoe-in for the British and Irish Lions Tour of Australia this summer, only a year-and-a-half out since making his international debut.
This Sunday sees Farrell face the only other man seemingly capable of stealing that fly-half spot from the English star as Stuart Lancaster’s side travel to the Aviva Stadium to take on Ireland and Jonathan Sexton.
But the 21-year-old isn’t about to get bogged down in what might happen this summer, instead concentrating on the job at hand.
“Sexton is an outstanding player. He controls a game really well and can do things others can’t, that are why he has earned a big money move,” he added.
“But I will let everyone else talk about who should be in the Lions squad or not or who should start at fly-half.
“It has not and will not enter my mind. I am focused on the Six Nations now and nothing else with England.”
MORE: The latest football news
MORE: The latest tennis news
BIOGRAPHY: Ethan Hazard
BIOGRAPHY: Daniel Sturridge