It had looked like Johnson might get his way and the parliament did back his bill, but then it promptly voted down his timetable, leaving the bill in limbo.
Johnson has already unwillingly requested that the European Union grant Britain another extension beyond Oct. 31, as he was required by law to do, and his aides have said he will now seek a general election.
The kiwi dollar has had "a week of grinding higher and it's run into some pretty heavy resistance" towards 64.50 US cents, Kelleher says. "Boris falling over this morning was the start of it."
After five or six attempts at breaking through 64.50 cents, it's likely to test the downside again, he says.
There's also been little news on the other major geopolitical situation preoccupying the market, the US-China trade war, although there were reports that China has been buying US soya beans as it has promised.
"They were buying Brazilian the day before, so they're certainly shopping around a bit," Kelleher says.
The New Zealand dollar was trading at 93.41 Australian cents from 93.42, at 49.72 British pence from 49.70, at 57.46 euro cents from 57.56, at 69.20 yen from 69.46, and at 4.5267 Chinese yuan from 4.5322.
The two-year swap rate edged down to a bid price of 0.9587 per cent from 0.9962 late yesterday. The 10-year swaps fell to 1.3775 per cent from 1.4500.