The dataset contains information about two realistic 6.6 kV weakly meshed synthetic UK distribution networks with 38 buses and 38 lines, and with 124 buses and 124 lines. The network files (MatPower format) include a “snapshot” or “steady-state” at a given time. The systems are ideal for testing flexible resources integration. The first network has buses with high demand (lower voltages) and distributed generation (higher voltages). In the second network there are potential voltage issues and congestions. Both systems can also be used for analysing network reconfiguration effects.