I shoulda said it better before, but
When I posted my suggestion that you take your problem to your parish priest, I did not mean to say that you need to take your wife to your pastor. It was obvious from what you had already written that your wife was not going to volunteer to see any counselor, and my suggestion was that you see your priest, and enlist his help with your problem.
If English priests are anything like American priests, you only need to tell your pastor your story-- that your wife is shunning her marriage obligations, and driving you toward divorce or adultery with her stubbornness-- and your wife will get all the counseling she can handle, whether she wants it or not. Priests are experts at delivered-to-your-door spiritual advice.
And if you're worried that going to your pastor alone will look to your wife as though you're "going behind her back," well, what the Hell? Things are well beyond the point where you need to worry about making her angry. You've got nothing more to lose, however angry she gets, and you just might have the luck to enlist an ally who can help you gain a bit of ground.
When in trouble,
Or in doubt,
Run in circles,
Scream and shout.