Head out behind the ticket office and turn right onto the small road.
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Bear right (second exit) at the roundabout and follow the road to the bottom. Go straight over the roundabout there (second exit).
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Go straight over the next two roundabouts (second exit then first exit) and continue until the left hand bend. Take the second right into the private access road to campus (you'll know which it is since there's a barrier at the entrance).
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Continue straight down this road, bearing right at the second barrier, then turn right at the end of the road. Straight ahead of you is the bus stop for the Sport Centre (the car park on the right on this road is Car Park 4, which has some sheltered bike hoops and is free to cars at the weekend).
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From the Sport Centre Bus Stop, facing the road, turn right and walk along the road until the pedestrian crossing. Cross here and walk up Library Road. Climb the first set of steps and walk until you reach the bridge.
Go under the bridge, then turn back on yourself and go up the steps. Turn left onto the bridge and continue through the doors at the far end to get onto the science concourse.