By 2020, gay marriage will be ‘law of the land’ in Northern Ireland.

Thousands marched for same-sex marriage on June 13, 2015 in Belfast, Northern Ireland. (Charles McQuillan/Getty)

Preparations for introducing same-sex marriage to Northern Ireland are going full steam ahead, with one senior minister declaring it will be “the law of the land” by 2020.

Northern Ireland is the only part of the UK where same-sex marriage is not…