Ashton was one of the try-scorers in the 38-21 triumph at Twickenham on 2 December, which gave coach Stuart Lancaster's side a timely boost after defeats to Australia and South Africa.
"It gave us the confidence to think we can go on and score some tries," Ashton told Sky Sports News. "The two weeks before we might have struggled with that a little bit, but it filled us with the faith we can push on from there."
England face Scotland at home in their opening Six Nations clash on 2 February and Ashton is wary of people expecting too much.
"It is difficult sometimes to go in as favourites but we are not thinking too much about it," he added. "We want to keep playing our own game and try do the same thing. We're at home again so there is no better place to do it."
Ashton has welcomed the return of Ben Foden, who will join up with the England squad after playing in the Heineken Cup with Northampton this weekend having recovered from ankle ligament damage.
"He's been playing well for Northampton. He's a threat with the ball, an outstanding player and finisher and we have good options in the back three now with Mike Brown and Alex Goode."
Gilbert has released a new line of rugby cleats. The Gilbert Virtuo 8S is part of the exciting new product. Check it out.
The entire All Blacks apparel line has been updated for 2013/14. Check out the New Zealand All Blacks polo.
The Nike Tiempo is a solid rugby cleat and one of few styles still made from full-grain natural leather.
The Gilbert Blitz 8S rugby cleat is a great cleat at a great price of $69.99. Get a new pair of cleats today.
A cool looking all black rugby cleat with the high performance adidas is known for. Get in the Gear!
Wear the crest of the British and Irish Lions on your t-shirt. A great look for the summer.
The All Blacks Performance t-shirt is black with hints of blue from the training jersey. Very Cool.
The New Zealand All Blacks training jersey for 2013/14. Get in the Gear!
The USA Rugby Pro Alternate rugby jersey is perfect for any fan of the Eagles. Get yours to wear during the summer Test matches.
The NEW All Blacks 2013/14 jersey has arrived at World Rugby Shop. Dare to wear the colors of the All Blacks.