I'm an 'Old Blue'.......leaves most HR personnel looking baffled, just the way I like it. Sounds a bit pervy, I know, but it actually means I went to the religious, royal and ancient foundation (their words, not mine) of Christ's Hospital School, Horsham, founded in London in 1552 by King Edward VI, which makes it the second oldest school in the country after Winchester.
See, Peter was right; I am posh! Hasn't opened too many doors for me, though....
If anyone's interested, here's their Wikipedia entry:
http://en.wikipedia.org/wiki/Christ's_Hospital