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PLAIN SAILING

Portsmouth Harbour's skyline is changing by the hour as the slipformed twin concrete legs of the quayside's £21M Spinnaker Tower rise 3m every day. Now standing at roughly 70% of its full 165m height, the structure's legs are being metamorphosed into a single upper mast, in a complex operation being carried out by specialist contractor Bierrum. In September, main contractor Mowlem will add 1,100t of steel spinnaker sail and upper observation floors to create the town's latest tourist ...

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