North Sea oil is currently flowing ashore in massive quantities. But the first phase of the boom is almost over and companies are already vying with each other with plans to extract oil from the more inaccesaible fields. Can British construction companies benefit from this new phase? The programme looks at the first stage of North Sea oil development during the late 60s and early 70s and finds that despite the massive contracts involved, many of the orders for rigs and other extraction equipment went abroad. With Brian Widlake and Valerie Singleton