Doug,
I can only apologise for the pain and distress my post has caused you.
I meant to say that "This version of the Tesco App is only available on Nokia". Now, in truth, I don't know what would have happened if I had clicked on that link with an iPhone. Tesco may well have redirected me to iTunes. However, I think that's unlikely.
I've updated the post to reflect that.
Thanks for your comment.
T