But Farrell, who had kicked all three conversions, added a penalty, before England scored again on the half-hour mark.
Cokanasiga was named man of the match after Italy were swept aside in the penultimate round of the Championship and was compared to Jonah Lomu by Sir Clive Woodward, but the Fijian-born wing is not even on the bench for the Calcutta Cup showdown.
'He's still learning from being around the squad and will feature heavily in our warm-up games for the World Cup'.
"Scotland are a hard side - they are always at you, they play with a lot of enthusiasm and effort and have got a lot of attacking strings to their bow", he added.
"I think we just played good, Scottish rugby in the second half".
"I want him to play 100 Tests, I don't want him to just play 10 Tests. And when they're ready to go, you let 'em go". 'It's about taking a measured approach at the start of their career, letting them develop their game and exposing them to the right games.
"Joe's a good, young player and we're looking after him", Jones said on Thursday.
"Sometimes you push young guys forward and sometimes you've got to pull them back".
"You've got to keep players' feet on the ground". I've got him on the right track. 'As soon as you tell them they're not in the team, you get this blank look.
Exhausted and bewildered, England summoned the strength for one last assault that saw Ford sprint over to level the final score, although as holders the Scots retained the Calcutta Cup.
"There is proper reasoning behind it. He's always getting beaten at pool and darts in the team room and but still always got a massive smile on his face!"
There are also two changes in the pack, with Mark Wilson back at blindside flanker instead of Brad Shields and prop Ben Moon returning in place of Ellis Genge.
Jones has reverted to his first-choice midfield, with Manu Tuilagi and Henry Slade paired in the centres.
Eddie Jones has lit the fuse for an explosive Calcutta Cup showdown by poking fun at Scotland's awful record at Twickenham.
Starting number nine Ben Youngs will become England's most capped scrum-half on Saturday, overtaking Danny Care with his 85th outing. Other people decide that.
Jones says the comparison was "rubbish conversation" earlier in the week.
"Now, I'm not focusing on that, because what we did in the second half just doesn't happen in sport - or very, very rarely - so that achievement is incredible but I know it'll hurt the players and that hurt will drive them on to make sure we're better".
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