You'll want to visit TimeWarp UK
for Rocky info in that part of the world. I don't believe there are any weekly showings of the movie up there currently (and by "up there" I mean the entire United Kingdom and Ireland). There's a page here listing upcoming showings and RHS tour dates: http://www.timewarp.org.uk/uktour.htm
. It looks like the Dr. Scott's Extra Forks cast in Glasgow will have a couple of shows in early November. London appears to be having a Sing-A-Long-A showing on Halloween. That's more like a Drafthouse singalong than what you'd think of as a Rocky screening though. You can ask for more details on the TimeWarp forums
P.S. I wouldn't put much stock in what you see on the Interactive Theatre List. It's frequently inaccurate and wildly out of date.