I therefore tried moving 'GL-C-007' to kHueBulbDevice and this worked OK with the colour in Indigo. Incidently, I also tried it under kLivingColorsDeviceIDs which also enabled the colour option.
It appears that on initial device creation in Indigo, whatever 'GL-C-007' is defined as in supportedDevices.py (confirmed supportedDevices.py file saved and Hue Lights plugin restarted prior to device creation), no colour option is available for that device in Indigo. This doesn't change following a subsequent plugin restart. However, if then I move 'GL-C-007' to another colour bulb type, save supportedDevices.py and restart the Hue Lights plugin, I get the colour option appear. This is the only way I have managed to get the colour option to work in Indigo for this device type.
Please can you perhaps update the plugin so I don't have to do this trick in the supportedDevices.py file to get things working?
In the Hue iPhone app, both Colour (color) and hue controls are available, although the hue control acts a bit odd perhaps due to the lack of a W wire connected on the controller shown below: