As you used Midland VW before you could get your second spare key programmed by them, I bought a cheap second hand MK5 key and gutted it for the electrics and bought a new shell, blade and blank Immo4 chip.
Got the key blade cut by the local locksmiths but the final remote programming and immobiliser matching was done by the garage, I think overall it costed me around £60 to get my second key done and it works fine for me which adds piece of mind should I happen to misplace my original.