It's not a double standard either, you're compairing apples to oranges. Two different mediums are determined to have two different effects once the level of interactivity is taken into account.
Beyond that, it's already well documented that the BBFC rates films in a somewhat inconsistent manner because they take into account the neccesity of the event, the context of the event, and the overall tone (See Ichi the Killer Vs Irreversable, which pretty much features the most disturbing scene in a movie ever). Call it hypocritical all you want, but that's a very simplified way of looking at it. If you want it to operate on some sort of boolian principle you're going to be looking at a lot less questionable content in England.