[Firewire]

No, it's a birth certificate. It should reflect the information of your birth. You should, however, be able to alter your name via deed poll and go by a different name on your passport etc. but I believe that the birth certificate shouldn't be altered.

[Z]

I'm perhaps missing the point but is there some legal benefit or reason why people want their birth certificates changed to reflect their new gender? Because if it's just for person preferences then I'm firmly in the no camp. It'd be like getting a nose job and then editing every single photo of you prior to getting your nose fixed photoshopped - ultimately, what's the point? Your birth certificate is a piece of paper. It would be a lie to say that you were born female/male if you weren't. It's just a statement of facts, essentially.