Ravi Bopara watches as his cut shot is caught at backward point
Paul Collingwood felt England's batsmen had made some poor choices as they were bowled out for 160 by New Zealand, chasing 183 to win the third one-dayer.
"In terms of decision-making we weren't quite there," the England skipper said.
"The effort was certainly there all day and I'm not going to blame the bowlers who were fantastic, but as a batting unit we should have got 180-odd."
"It was very disappointing - we were in a position to be pretty ruthless and go 2-0 up but things didn't go our way."
England enjoyed several moments of supremacy on a chilly day in Bristol, reducing New Zealand to 75-6 at one point, and starting their chase well when they were 62-2 early on.
But whereas New Zealand had lacked the killer punch in the Test series, this time it was the home team who let the opposition back into the match.
Collingwood maintained a positive outlook for the last two matches in the series, but his team now have to triumph in both to win it.
He said: "The batsmen seemed to edge a few or hit them straight to fielders, but we've played some good cricket so far in the series and will hopefully win the next one."
Daniel Vettori, the ecstatic New Zealand captain, said: "It keeps us in the series and we go to London with a lot of confidence.
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