Thanks Will,
You can switch between parties either through the stacked (overview) chart, or by clicking on any topic bar (eg. click "Electoral" bar to see all parties electoral scores, then click any Party bar for party chart.
We could add other layout sections that always display all areas and parties guaranteeing a single click will get you what you want, but with space constraints we had to compromise...
On your second question. There is a bar chart for every area (topic) showing party comparison, which we felt was more meaningful than a pie broken down by party.
We did have a section for the "United Left Alliance" which transpired to be too difficult to score meaningfully, so we've dropped it for now.
Scoring independents would really have to be done individually and although that would be very interesting, it would require more resources than we have right now.
Cheers,
Paul