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BruceML wrote: Is it possible to view textures in viewport when using node material. At the moment they are all default white

The viewport materials are not with textures by default just for Vram and computation optimization purpose.
But you can enable viewport textures with 2 methods:
1) Connect any texture of the node editor to the Output Viewport Color port. And it will work constantly on viewport until you mute it. But this connected node will be for Viewport, not for Interactive preview render.
2) You can switch Solo Mode on any node in node editor (including materials or unconnected nodes) and show the texture both on Viewport and Interactive Preview render.