The prospect of a delayed Brexit may be pushing up the pound, but it’s not the best news for the UK economy.

Sterling has rallied above $1.30 this week amid increasing signs of support from lawmakers across Parliament for extending the negotiating period set to expire on March 29. While that would remove the imminent possibility of a chaotic no-deal scenario, it would leave the UK worse off than if Parliament accepted Prime Minister Theresa May’s current plan, according to economists.

Pushing back the departure prolongs the uncertainty that has already hit business investment and pushed consumer confidence to the lowest since 2013, according to JPMorgan Asset Management. Worse still, it would be unlikely to help the government reach any better outcome.

“Kicking the can down the road has a cost,” said JPMorgan AM global market strategist Mike Bell. “Time has a cost, dragging on growth.”

The lack of a settled deal is causing firms to “press the pause button”, despite low interest rates making this an ideal time to invest, Bank of England Chief Economist Andy Haldane said in an interview. “On the assumption that some deal is done, that would reduce uncertainty and, we think, cause people to take their finger off the pause button and do a bit more investment spending,” he said.

For Dan Hanson at Bloomberg Economics, it’s a question of how long the delay lasts. His uncertainty model suggests a three-month postponement could slow growth to 1.5 per cent this year from his central projection of 1.7 per cent — which is based on some form of Brexit agreement being reached with the EU in time for a March departure. But six months would crimp it to 1.3 per cent.

Beyond that time period, he sees a less clear impact as the cliff-edge disappears from the view of businesses and households, potentially lifting some of the paralysis. Still, the economic hit from a delay is likely to be far smaller than the disruption caused by a no deal — helping to explain the pound’s recent strengthening.

Last year, the BoE’s worst-case scenario saw the economy shrinking by 8 per cent within a year, property prices plunging almost a third and the pound losing a quarter of its value.

No deal

Most economists still see a no-deal Brexit as unlikely. The Centre for Economics and Business Research puts only a 10 per cent probability on that outcome.

On Wednesday, May faced repeated questions in the House of Commons over whether she should extend the exit process known as Article 50 and delay Brexit beyond March. She remains against the idea, but her answers didn’t close the door on it.

“Extending Article 50 I don’t believe resolves any issues,” May said. Parliament will still need to decide if it wants a deal, a no-deal Brexit, or no Brexit, she added.

A no-deal is the hardest outcome to assess, according to Hanson, as the likely weak start to this year will continue to weigh on the annual figure in any scenario. The most he can see the 2019 economic growth rate picking up is to 2 per cent.

Some of the damage to the UK from the Brexit referendum won’t be reversible. The biggest banks looking to serve continental European customers intend to move 750 billion euros ($855 billion) of balance sheet assets to Frankfurt.

The dreaded ‘no deal’ is still an option

That final option — stopping the process altogether — is still possible, according to a European Court of Justice ruling in December which confirmed that the UK has the right to unilaterally revoke Article 50, although lawmakers have so far been loathe to discuss overriding the outcome of the 2016 referendum.