Integrated Operation (IO) is often perceived as a long term, high cost commitment for an organisation. This perception often makes it difficult to gain the senior sponsorship required to get a programme off the ground for mature assets. This paper outlines how Maersk Oil North Sea UK Limited (Maersk Oil UK) designed and delivered a project, which generated real business value for mature assets within a short timeframe. Key focus in the justification, design and implementation of the project, was the ability to deliver a solution that fitted the business needs and gave immediate value without compromising future opportunities. The project was designed and implemented as the first step towards and proof of the concept for Integration Operations solutions with focus on production optimisation and reservoir management within Maersk Oil UK. The key business process focus was on well test automation, well and reservoir monitoring and production optimisation. All technologies used were readily available and only mature software solutions were used. Part of the required technology was already available in the company however without using the full potential. The paper describes the approach to, and how senior business sponsorship was obtained and retained, how business needs were identified and addressed, how the technology requirements were satisfied and how this influenced the work flow and operation. The paper includes what made the project succeed and why some of the initiatives were less successful. Most importantly, the paper explains how the capabilities developed and delivered in excess of the investment within the projects implementation phase and how Maersk Oil UK continues to gain value of the mature assets. Summary: Full project cycle 1.5 yearsScope includes 3 subsea operated hubs for 8 fields with a total of 45 producers, 13 water injectors and 2 gas injectorsPayback within the project lifecycle.