Sending human engineers to carry out offshore inspection and repair activities can be both dangerous and expensive, and so the idea of using Robotics and Autonomous Systems (RAS) to handle such tasks is appealing. The use of such systems is likely to improve safety aspects since personnel are removed from the dangerous environment. Furthermore, cost reductions and increased energy yields through better optimised operations and maintenance are possible. This paper aims to provide researchers, developers, and regulators with an overview of the tools, techniques, and issues that may be relevant to offshore renewables. We are considering a range of offshore robots, such as autonomous surface vessels, and will highlight the role of verification and validation techniques for assessing these new, often autonomous, behaviours. This work has been submitted to the IEEE for possible publication. Copyright may be transferred without notice, after which this version may no longer be accessible.