Paintable Curved V-Shape Wall Uplight in Ceramic

Is there sufficient room in these to get the fitting connected and fit the bulb?
Yes there is sufficient room - we have never heard of any difficulty.

There doesn't seem to be A hole at the bottom where I can run the mains cable down the wall in the corner-is this light only designed to have the power cable coming through a hole in the wall and feeding through the inside back of the uplighter?
These wall lights have are designed to have their connection through the wall, The whole is on the back of the fitting. There is no hole at the bottom.

Is this dimmble & suited for a Philips hue e27 bulb?
There is no reason why this cannot be used with a Philips Hue lamp (and the fixture is dimmable).

What is the minimum distance from the ceiling for these up lighters please
There is no minimum or maximum distance for these fittings, You could have it as close as you require, We would recommend about a foot from the ceiling though.