England were left anxiously monitoring the fitness of Manu Tuilagi after a groin problem sustained in the 24-17 defeat by France placed his participation for the rest of the Guinness Six Nations in doubt.
But Jones made it clear on Thursday he would be travelling straight back with his squad this time.
'I spoke to Finn on Sunday night to let him know that we wouldn't be making any changes to our squad, Townsend said yesterday. "We've got an obvious game-plan against them".
"[Ball-carrying] has been part of the focus. So, we have done some work on that area this week". Marler is not even in the squad.
The second row sees George Kruis come in for Charlie Ewels, the Bath lock who has also paid the price for a below-par opening to the Championship in Paris.
Jones also gave Underhill his first cap on the tour of Argentina in June 2017.
The other notable change is 33-year-old Heinz coming in at scrum-half for long-term starter Ben Youngs.
Jonny May is completed by the Scotland protection
In the reserves, Luke Cowan-Dickie was absent due to his wife going into labor, so Tom Dunn could make his debut as the replacement hooker, as could uncapped Saracens flanker Ben Earl.
That was until replacement prop Genge touched down 10 minutes from time after England were awarded a scrum five yards from the post when Stuart Hogg was adjudged to have made downward pressure on the ball, having spilled it over his own line.
Heinz missed the World Cup final defeat against South Africa with a hamstring injury, a match in which Youngs struggled behind a retreating pack.
"They tend to look a little more at themselves after losing", said Farrell. "You saw that with England here a couple of years ago". "We have sought to address the issues from the France game and have had a really good and sharp preparation for Scotland".
"It was probably my first insight into the emotion of the occasion and I was probably a bit naive to it before, getting booed off the bus and seeing the reaction of the Scotland players when they won, seeing the crowd and how much it means to everyone up here". Heinz's arrival in the second half did prompt a noticeable improvement in both of these facets and he has been rewarded with a starting role as a result.
"We were proud of parts of our performance in Dublin at a very hard venue", Townsend said. "Being 17 points down is tough to get back from and we don't want to leave ourselves that challenge".
"I'm happy to say that if I went back to that game again, I can't think there's a team in the world that would have beaten South Africa that day".
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