England beat Canada 21-9 to win the World Cup
Waterman scores England try (31 mins)
England's Emily Scarratt try, 3 penalties, 1 conv
Canada's Magali Harvey three penalty kicks
Ireland lose third place play-off 25-18 to France
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Canada's forwards are probing around the fringes of the breakdown - drawing in Maggie Alphonsi and the rest of the England back row before spinning wide where they hope Magali Harvey might have a bit more room to work in.
It is a tactic that has taken them up to within 30 metres of the England line.
Amy Turner
Ex-England scrum-half on BBC Radio 5 live
"Emily Scarratt is the silent assassin. She doesn't do anything fancy, but she's so clinical, and she's keeping England in this game.
"This is really tight. It's massive for both nations."
England get just what they need. Canada give away a penalty almost straight from the kickoff and Emily Scarratt steps up to stop the rot after nine unanswered points from Canada.
Magali Harvey's kick scrapes over and, after a brief look at each other, the linesmen's flag pop up!
Two points in it.
England have been susceptible to the driving line-out and Canada have got them backpedalling all the way to their own 22-metre line. Marlie Packer loses her head under pressure, straying ahead of the offside line and giving away a penalty.
And Magali Harvey is going to kick it from the angle....
Laura Keates and Rebecca Essex are on in place of Sophie Hemming and Jo Gilchrist as England make changes in the front five. Might England's greater strength in depth mean they finish the stronger?
Canada have a line-out up around halfway.
Amy Turner
Ex-England scrum-half on BBC Radio 5 live
"Canada are building phases. Don't write them off. They've got a sniff - they can sense England are a little lethargic. England have to be careful, because Canada could come away with a sneaky three points.
"England are trying to force it, and errors are creeping in. They just need to settle down."
England's Natasha Hunt is a sparky, spiky scrum-half. Are they any other sort? She takes a quick tap penalty, shrugging off a couple of tackles and making some quick yards. The ball is spilled on the next phase though and England are not putting together their game plan as they were in the first half.
Canada bulldoze England in a scrum up around half-way and tap and go from the resulting penalty with Kelly Russell. The momentum is with the underdogs at the moment.
Katy McLean chances her boot with a risky cross-field punt and very nearly delivers the ball into the hands of the lurking Magali Harvey. The Canada speedster narrowly fails to gather the loose ball.
Meanwhile Claire Allan is on for England as full-back Danielle Waterman heads off for treatment on a cut to her cheek.
England women's international footballer Rachel Yankey:, external Half time and we are 11-3 up come on England!!
John Blenkharn:, external 40 minutes away from greatness! Keep focussed and be clinical England!
Amy Turner
Ex-England scrum-half on BBC Radio 5 live
"England have come out for this second half a little bit sleepy. Katy Mclean and Sarah Hunter - as captain and vice-captain - need to get everyone together and say: 'Buck your ideas up.'"
BBC Radio 5 live
Sara Orchard, BBC Radio 5 live commentator: "Magali Harvey has the most curious kicking action - it's like a toe punt. It works for her, but I'm sure there must be kicking coaches up and down line who are saying: 'Just give me five minutes to coach her.'"
Perfectly judged by Magali Harvey as the ball makes it over the crossbar with four feet or so to spare.
It is a five-point ball game.
England give away a penalty at scrum-time - it has been a mess at the set-piece so far today - and Magali Harvey takes on the shot at goal. It is at the edge of her range though. Thirty-five metres to the sticks.
England's Tamara Taylor fails to roll away in the tackle and gives away a penalty from which Canada clear up to the half-way line.
Canada are looking to run the ball from everywhere. They have eight points to make up and their best way to do so is spin the ball and hope they strike champagne.
Katy McLean boots the ball long to start the second half and Canada are safe and secure underneath it.
Amy Turner
Ex-England scrum-half on BBC Radio 5 live
"Canada have a few high-profile players who are well-known on the sevens circuit, such as Mandy Marchak, Kelly Russell and Magali Harvey. A lot of them are young ambitious players, and they'll be sucking up the occasion and learning loads from it.
"Harvey is dangerous with the ball in her hand, Russell has got a great engine. Marchak has made a couple of breaks through central midfield and asked England questions - those are the three Canada players to watch in the second half."
Apparently Canada coach Francois Ratier told his team pre-match to remember how Muhammad Ali beat George Foreman in the Rumble in the Jungle and there is something of the rope-a-dope about their performance today.
They have defended superbly and, with the likes of Mandy Marchak and Magali Harvey out wide, have the ability to land a late knockout punch if England don't make their pressure count.
Amy Turner
Ex-England scrum-half on BBC Radio 5 live sports extra
"Canada have points on the board at half-time, which will give them hope of building some momentum. England need to reassess their defensive structure to stop Canada breaking through midfield gap. In attack, England need to build phases, stay confident and nip out all the errors - and that will do the job."