Ireland flanker Sean O'Brien says England's run over the last 18 months has been incredible.
Eddie Jones' side will come to Dublin's Aviva Stadium on Saturday looking for a record 19th straight win.
It would also hand them successive Six Nations Grand Slams with victory.
Leinster star O'Brien says it is England's fight when the going gets tough that has really impressed him.
"I suppose their record speaks for itself. They've been a very, very good side and a very difficult side to beat. They've been in some tight scraps and came out the right side of them," he said.
England are already assured of winning the Six Nations championship as they sit out of range of Ireland and the other teams.
Jones' team are on 18 points, eight points clear of Ireland and France. A bonus point win for either Ireland or France in their respective games this weekend would only take them up to 15 points each, well short of closing the gap on England at the top.
Wales and Scotland are both on nine points heading into the final weekend which sets up an exciting battle for second place.
The Scottish play Italy while Wales and France will go head to head.
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