I managed by the wrong cable for my monitors. This is the correct TRS to male XLR balanced cable. Seems to be well made and looks like it will survive being trodden on at the front of the stage. Lengthwise it's certainly suitable for this application, although I now wish I had ordered the 10 meter cable.
This cable has sold me on the Cordial range. It appears to be well made, with good thick quality installation and professional standard jack and XLR connectors.
I was worried that the cable wouldn't be good quality at this price. However, this looks like it should last a significant period of time. I'm now about to place an order for a second as a spare and a few more of the Cordial cables.