Australia turn the screw on day four

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Tim Paine completes the stumping to remove Butt•PA Photos

... but he got a top edge to slip just before lunch•AFP

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Rudi Koertzen bids farewell to Lord's as he leaves the field after umpiring in his final Test at the ground•Getty Images

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Butt could not believe his lapse in falling to North's first ball of the innings•Getty Images

North was overjoyed at Akmal's dismissal•Getty Images

North was the surprise weapon for Australia, picking up six wickets on either side of the lunch interval•Getty Images

Umar Akmal didn't hold back during his brief innings ...•Getty Images

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North led Australia from the field after his six wickets set up their win•Getty Images