Today I got my new birth certificate, before I applied for it I rang them and made sure it was worth getting and wouldn't mention previous names and was told of course it doesn't what would be the point of getting a new birth certificate if it did.
Got the new certificate today, was very excited but it has a big block on it saying I had previous names. Although it does not mention what the name was, I can't think of any other situation a birth certificate would say this other than being a special transsexual birth certificate.
Very disappointed I still can't use this for ID since it outs me.