Chief Strategy Officer Marci Surkes talks to the BBC about MPs returning to the House and the challenges facing Prime Minister Mark Carney.

In politics it's usually prudent to under-promise and over-deliver, said Marci Surkes, chief strategy officer at public affairs firm Compass Rose and a former policy director to Carney's predecessor, Justin Trudeau.

"Mr Carney has taken quite a different tack, where he has really set the bar very high in terms of expectations," she said.

She added: "There's already impatience from those who are waiting to see results."

The prime minister will also have to find a way to deliver on major commitments, including a multi-billion dollar increase in defence spending promised to Nato partners, notably the US.

It comes amid lower revenues from tariffs and other financial challenges, likely leaving officials "shaking every couch cushion loose for change", said Ms Surkes.

"Here we have a circumstance where the government is trying to walk and chew gum at the same time, if you will - where it is both trying to identify cuts and restraint, but also has committed publicly to some very significant investments," she said.