Two days. Two whole days Sky managed to go before ******* me off!
There is no self-install option for additional mini boxes. It's £50 installation charge which not even the retentions department could waive.
Nowhere on the website is this mentioned, that I can see. What's most irritating is that I consciously decided to wait until after installation, to make sure everything was working ok, before adding the second box as I figured it was £99 extra either way. Had I known about this hidden installation fee I'd have added the second box to the initial order and saved myself £50.
Well done Sky, seriously. New customer back after 15 years and on day three you've managed to seriously **** me off. Excellent customer service there.