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I have just found this..
boy-producing sperm swim faster but don�t live as long, whereas girl-producing sperm swim slower but live longer. Because of this, he says that if you want a girl, it�s better to have sex two to four days before ovulation then stop, as the girl-producing sperm are more likely to still be present when you ovulate
For a girl, have sex regularly from the day your period ends until two to four days before ovulation - which occurs about 14 days before your next period is due - then stop. For a boy, abstain or use condoms until four days before ovulation, then abstain totally until 12 hours prior to ovulation, then have sex, just once.
eat lots of calcium-rich foods for a girl while cutting down on salt. For a boy, increase salty foods and red meat and cut down on dairy products
To conceive a girl, Dr Shettles recommends the missionary position and shallow penetration. To conceive a boy, try rear entry with deep penetration.
I think this is what i found previously - I can't have looked very hard!!!