I don't know it the UK 05 X5 is any different than mine but it was right in front of me when I looked for it. Remove the drivers side panel in the back (or boot as you brits call it) where the CD changer goes . If you have Navi look behind it on the bottom of the shelf and you will find a blue connector with a black jumper connected to it. At first the jumper looks like wires going to something else but they are only going in and out. You gotta take that jumper out. (key off of course) and plug that blue connector into the voice module. If it was a snake I would have been bitten a half a dozen time.

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