How to authenticate my Birth Certificate for marriage in Mexico?

I require that my Birth Certificate be authenticated beofore i go to Mexico. The government there (in mexico) need my Birth Certificate to be authenticated by the government here (in england). Now, I don't know what this means. Does it mean a stamp, or a signature, or invisible ink? I haven't got a... show more I require that my Birth Certificate be authenticated beofore i go to Mexico. The government there (in mexico) need my Birth Certificate to be authenticated by the government here (in england).

Now, I don't know what this means. Does it mean a stamp, or a signature, or invisible ink? I haven't got a clue.

Where can i get this authentication done?
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