The emerging medium voltage direct current (MVDC) distribution networks are becoming more attractive due to their flexible power flow control and lower losses compared to traditional AC networks. This will significantly increase the wide uptake of renewable energy sources. The optimum utilization of the existing assets is an important aspect in grid upgrading and planning. One feasible option is to convert existing MVAC lines into MVDC operation. One of the practical demonstrations is the"ANGLE-DC" project which is also the first MVDC link in the UK. This paper highlights the innovative approach, challenges and key benefits delivered by the ANGLE-DC project.