After having read loads on here about Art scholarships - lots of helpful advice - i wanted to share what we did for the boy and it worked - hopefully this will help someone else and not to be worried.
The portfolio was divided into four sections to showcase range and flair:
1 = Still life - pencil and ink only,
2 = Colour work (paintings/ pastels/ expression work/ abstract, etc.),
3 = 3d work - glass making, furniture, wood work, etc.
4 = Print work and lino prints.
Each section had about 4-5 good pieces in it. The idea was to showcase the range, style, flair and personality of his approach. We purchased an A3 folder and also 10 A3 slip cases (these had black backing card in them - from Amazon cheap). We loose bound the slip cases together so they formed a very large book that was inside the overall black folder. We placed work both sides of the slip case and labelled them accordingly. This also helped with our boy in the assessment/ interview part as he discussed the pieces as talking is not his strong point; the labels giving him a cue.
We also included a bulging sketchbook - this was also filled with literally every scrap of drawing he had, stuck them in, added to them, etc. ideas, progression of a study, doodles, etc.
Finally we also created a PowerPoint 8 slides long. Title slide, summary intro slide, a slide for each section - showing the same work as in the slip cases, end slide. This PowerPoint was sent before the assessment directly to the art teachers at the schools. Some schools wanted one , some didn't express either way. Not one complained about our approach.
Outside this portfolio work we also created home based still life studies to prep for the assessment from October time to just after xmas. Each week he sat for 20mins then 30mins then 40 mins, doing a simple pencil study of a cloth, wine bottle and one other object together. This helped him learn how to construct and approach, shade, tone, etc. and hone/practice his natural ability. These were added to sketchbook.
We applied to 3 independent schools and he received offers of an art scholarship at two of them. :)
Hope this helps someone else. Prep and practice is the key we found.