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Farrell put the difference between the sides in part down to the influx of new faces introduced to the Ireland side.
"It's completely different sides of the spectrum really, we'll learn a lot about that," said Farrell.
"Playing a really good side, number two in the world, at home."
England had the game won by half-time as two Jonny May tries, one a scintillating effort starting from his own 22, put them in command as Ireland struggled to get over the gainline.