Searching the internet I've seen on a website that SD also has UK CAA VFR charts. I would rather use the CAA VFR chart then the SD chart. Does anybody know where to find these. Any help is much appreciated.

I suspect you are looking for the raster CAA charts that Memory-Map and other use. Skydemon uses vector charts built from gazetteer data and whatever Tim and the boys put in. As NJE says, in SD, chart type means 'style'.