Synopsis: The UK National Underground Asset Register has gone through rigorous pilot and preparation phases and has learned a lot about the data which we will share for 3 regions before a national roll out. However, despite all the best laid plans there will always be exceptions and unexpected scenarios which will need to either be fitted into the data model or have the data model change in order to fit them. The way in which we make these changes could make or break a project like this which is incorporating over 650 different datasets into one model, the OGC MUDDI model. What's more, if we do it right, a standardised model can help to drive positive change within the industry to improve data quality and set a standard to aim for.