Mr Aprilis and I have an 11yr old daughter and are not married. As far as I'm aware he has few, if any, legal rights unless we were to draw up a Parental Responsibility agreement via a Solicitor...or of course get married.
It's never really been an issue for us until last week when we got a form to fill in for a multiple passport that our daughter's school is applying for. They are going on a day trip to France and it clearly stated on the form that it could only be signed by someone who held legal Parental Responsibility for the child to whom the form pertains. This meant that Mr A couldn't sign it. It didn't bother him unduly as long as it did get done and our daughter could go. However, it did bother me. As far as I'm concerned he has as much right as me where our daughter is concerned, whether we're together or not. It's about what's best for her, not us, in my opinion. But that's because I'm a fair and reasonable person and not everyone is when push comes to shove, especially after a relationship break up.
I don't know all the details but I'm fairly certain that legislation was changed a few years ago that gave registered fathers automatic Parental Responsibility if their children were born after a certain date. Perhaps you can look into that?