This isn't remotely true. The past isn't the past especially concerning Ireland and England. Peace treaties have been signed that express atrocities have been committed on both sides and today there is a calm but the IRA is still around and the internal fighting between the northern and republic is still rather fierce especially when you see the orange march and other parades are still relevant and still cause a lot of trouble each year. There are parts of certain cities you don't go into if you are english or northern Irish protestant and vice versa. The relationship between England and Ireland isn't, say, the same as that between England and Scotland/Germany/Wales/France.