Bill-
As I tried to imply in my introduction, these ratings were not done based on an clinical evaluation of the GCA of each course, but rather on the rater's enjoyment of his round of golf at each course, which might include the clubhouse, the members he met, etc. My guess is the rater subscribes to the maxim that "a day on a bad golf course is still better than a day at the office" and his ratings are a bit generous because of that. On the other hand, there are many, many enjoyable golf courses in GB&I.
Jonathan-
Brighton Hove is not graded on the list I have. Brookmans Park is a 'B.'
DT