I live in Berkshire and I must admit I am also surprised by how few courses we have. I guess it is partly because we don't think in terms of county boundaries and there are loads of good courses around, but some of them are in Surrey, Oxfordshire or Bucks.
However, if you look on the Sunningdale website, the postal address is in Berkshire. I think those 2 courses would sneak into the top half of the ranking:
http://www.sunningdale-golfclub.co.uk/contact-usThere will be one fewer Berkshire course soon. Bearwood (the small 9 holed round the corner from my club Bearwood Lakes) has been bought by Reading FC and the property is to be converted into a training facility.
http://www.getreading.co.uk/news/local-news/golfers-flattened-reading-fc-bid-6247656As for the rankings, Sunningdale apart, it has all been said. I think the broad strokes are correct, but after the top 3, who knows really?
Bearwood Lakes may not be everyone's favourite, but I think it is a fine course and the head greenskeeper shares a lot of the sensibility of GCA members - firm and fast, clearing trees, nice natural features and varying the shape and distribution of the rough to keep it fresh.