Toby Flood admits England will have to be much more clinical against Wales than they were against Italy if they are to lift a first Six Nations Grand Slam in a decade.
Stuart Lancaster's side head to the Millennium Stadium in Cardiff on Saturday with everything on the line as the home side chase their own Championship hopes.
A Welsh win by eight points would see them retain the title. Anything less would lead to England being crowned champions.
The visitors will arrive unbeaten after their fourth consecutive tournament victory – an 18-11 win over Italy at Twickenham on Sunday.
The Leicester Tigers fly-half kicked all of England's points thanks to a perfect six-from-six record and will now do battle with fit-again Saracens fly-half Owen Farrell for the starting shirt in Cardiff.
England created several chances, especially in the first half, against Italy but poor finishing saw them butcher the lot on their way to a try-less win.
If they are to beat a Welsh side that has won three on the bounce since an opening day defeat by Ireland, Flood says the quality of finishing will have to improve.
"It was a quiet dressing room after the win over Italy," said Flood. "There was a fair amount of disappointment because we couldn't get ourselves into the game in the second half.
"It was a pleasing first 40 minutes in terms of what we created but it was disappointing not to have kicked on and scored some tries because we certainly had the chance to.
"We are going to have fewer chances against Wales and we have to be better at finishing them. Whether we took our foot off the gas in the second half or not, who knows?
"The anxiety factor is an interesting one. It's a young squad and it has not been in this position before.
"There could have been extra nerves out there and a bit of quietness and rash decision-making at times perhaps.
"We will learn from it because this team is always trying to evolve.
"We were also forced into some serious backs-against-the-walls stuff late on and there will be lots of that this weekend. The desire we showed to win was good."
