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I also played in those ancient history days - made it to 1st grade at Uni, having played ALL of my rugby in WA. We were few and far between - I can recall a couple of others at Uni and a small handful of others at the other clubs, but mainly ex-pats as Jasper says.
Funnily enough, I am in the same position as a local ref - there's very few of us who either played or started reffing in WA.