 South Glamorgan County Council originally awarded the contract for the management , installation , testing and commissioning of all electrical and mechanical services for the tunnel , and the water pumping stations to EI · WHS Ltd . They still maintain the tunnel on behalf of Cardiff Council . 
 South Glamorgan County Council originally awarded the contract for the management , installation , testing and commissioning of all electrical and mechanical services for the tunnel , and the water pumping stations to EI · WHS Ltd . They still maintain the tunnel on behalf of Cardiff Council . 
South Glamorgan County Council originally awarded da contract fir the management , installation , testing and commissioning of all electrical and mechanical services for tdatunnel , and thdaater pumping stations to EI · WHS Ltd . They still maintain thedannel on behalf of Cardiff Council .