I agree completely.
Entrants have spent four months building, detailing and painting their models but, in some cases, it appears that only seconds have been dedicated to the part that counts - the finished photos, which are used to judge the models(s).
The judges have a pretty hard time assessing the models from photos alone, so the last thing we want is a background cluttered with paint jars, tools, instruction sheets etc, with poor lighting and small, out of focus shots of the prime subject - the model.
It's your GB entry, your pride and joy, so give it the attention it deserves and set-up a simple, plain, neutral-coloured background, with good lighting and provide sharp, clear shots as required.
It's a simple job when using digital cameras, as the camera can be set for the required light-balance (white balance) for any lighting set-up, unlike traditional film cameras, where filters and at least a basic knowledge of photography is needed to get even passable results, so spend a few minutes arranging the model, background and light source(s) to do justice to your entry.
If we can't see it, we can't judge it ................