So as with all things, once you write them up you often find the solution. So in case anyone else has the problem the answer is as follows.
The problem was the windows image I created in Parallels was from a PC with USB 2.0. Thus the need for a USB 3 driver. From the Control Centre on Parallels click the configure cog. Then select the Hardware tab from the image window that appears. From there select the USB & Bluetooth option. There is then a twisty for Advanced Settings where USB 3.0 can be selected as a check box. Note that you need to stop the VM first. When you select this option it points you to the following URL to download the USB 3 drivers for Windows.http://www.parallels.com/support/xhc-drivers
Then install these in the VM and reboot. All should then work.