The Network Diagram for England & Wales showing the locations of the constraints contained in the constraints data. This file shows the location of the: FLOWSTH, GM+SNOW5A, HARSPNBLY, DRESHEX1, ESTEX, ESTEX3, ESTEX4, DUNSELEX, CANDUNEX, CANSELEX, NINSELEX, BOLSELEX1, SEIMPPR23 and SSHARN3 constraint groups.