The latest UMR survey on the flag referendum shows no significant change in flag preference from the previous survey conducted in late February.

Younger New Zealanders are the keenest to retain the flag, with 70 per cent of 18 to 29-year-olds backing the status quo.

The latest poll shows 58 per cent of New Zealanders want to keep our flag.

The figures show only 35 per cent want to change to the black and blue Kyle Lockwood design.

The survey says political polarisation is again very evident.

A narrow majority of National voters now intend to vote for change, but big majorities of other voters are voting for retention.

Voting on the flag referendum at 1.6 million votes so far is currently running ahead of what it was for the first vote.

That represents a turnout of more than 50 per cent with just under one week to run.