I bought this housing off eBay:
http://bit.ly/9IRHrW
and drilled out another hole for the boot release then just transferred the buttons and immobiliser chip from my spare key.

I must note that the housing it not a perfect fit. and you have to file away the plastic to get everything to fit nice and snug buts its worth it i think

was a gamble at first but easy enough to do once you get it