[Closed] Sky Broadband help - its blocking a specific website

Firstly (lets get this out there) it's not 'specialist' porn!!

My wife runs her own HR consultancy, for this she has a relatively simple website.
This website is absolutely accessible from all other systems, 3G, 4G, work internet, friends internet, Wifi hotspots, the works.
Only we can't get onto it at home - Sky appears to have blocked it, but without any reason we can find. There is no 'wall', sky shield hasn't been activated (no kids old enough to understand what an internet is) so I'm completely clueless as to why it's blocked.
The issue is, so is sky. Does anyone have any pointers?