A UK calendar has appeared on my phone. I live in New Zealand and don't need a reminder of the Battle of the Boyne! How do I get rid of it (why is it there)? There is no option to delete.

A UK calendar has appeared on my iPhone 5s. I live in New Zealand and don't need a reminder of the anniversary of the Battle of the Boyne!. It just appeared after the last update. No option to remove it in edit. How can I get rid of it? A New Zealand holiday calendar would be a help instead!