Plexus Holdings, the engineering company which serves the oil and gas industries, has won an £800,000 contract with Centrica Energy.Plexus will now supply Centrica with wellhead equipment, a mudline casing support system and services for oil and gas exploration activities in the Central and Northern North Sea.  Plexus' chief executive officer, Ben Van Bilderbeek, said, "Centrica is a highly valued customer and we are delighted that the company continues to appreciate the technical performance and cost saving benefits of our POS-GRIP technology and look forward to continuing to work with its team over the coming years." Plexus shares rose 2.8% in morning trading. BS