Irish President Higgins in historic U.K. visit

The first official state visit to the U.K. by an Irish head of state is due to get under way. President Michael D. Higgins will meet the Queen and address Parliament - another historic first. Ahead of the trip he said Anglo-Irish relations were at a high but warned there was "significant work" to do secure peace in Northern Ireland.
Background:
Irish President Michael D. Higgins in historic U.K. visit [BBC]
Michael D. Higgins: Ireland's poet president [The Guardian]