I went down the route of getting a blank blade cut and was planning for someone with
vagtacho to program it up, but the quality of key blank was truly crap (too narrow) and it has since gone rusty sat in a drawer.
I wouldn't trust the knock off stuff on ebay. Cheap great! No. It might have a new key blade but the immobiliser chip isn't and they can't be re-programmed. Genuine 2nd hand remotes are safe as long as you match the part number.
Yes, I paid a few quid over but knew I was getting a genuine new key and immob chip that would definitely work, with a guarantee