Well, I have an interesting tale regarding this...
MissChief very kindly sent me a code last week (thanks again, mate!) and I waited until my current subscription ran out (yesterday) before I signed up again in my wife's name in order to get the discount...
Anyway, on the website, I actually put my house number in the "house name" field as well as the address one, so it showed a double of my house number. Concerned, we phoned sky last night and explained the situation. The guy on the phone said it would be best to cancel the order and do a new one, but because we used the code already it was expired and he would need to raise a request for a new one. He promised to ring me back today.
Fast forward to 30 minutes ago, he rang back and explained he had a replacement code, but that it was a better offer. Basically he said Sky is 25 this year and he could offer me the full TV package (inc HD) for £25/month for 25 months!! We obviously jumped at that. So instead of the £33.65/month we got with the original code from MissChief, we got the same deal for nearly £10/month less!
The original installation date was set for the 19th am and the new one is 19th pm, so just as good really. Can't believe that my stupid mistake on the original order actually worked in my benefit!
G.