I think the sentiment of the second post was perhaps fair, but that the way it was expressed was needlessly harsh.
As for the Royal Grammer, it was too far away for us to consider, so I know little about it. But what is "qe" - is it Queen Elizabeth Barnet? If it's not a Bucks school, there may be few people who can give a useful and knowledgeable comparison of two schools in different authorities whose catchments don't overlap. You could also post the query on the Herts forum (which includes Barnet).
Until you get any specific info, look at BBC for league table data: http://news.bbc.co.uk/1/hi/education/default.stm
Also look at OFSTED reports, though beware that they are somewhat formulaic in the phrases etc they use: http://www.ofsted.gov.uk/
Also Google for the schools themselves and their websites.