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Buses and taxis normally deposit you at the Parkinson building - big white building with a tall clock tower, columns and steps in front - this is what it looks like (from an e-postcard!):
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If coming by car, come to the main entrance on Woodhouse Lane (by the Parkinson building), and follow the signs for the Visitor car park. The charge is £5. It can sometimes fill up, but as far as we know there are no major big events on 25th June!