EFFORTS by the British government and the unionist parties to stymie the conversation on future constitutional change have actually brought a greater focus on the growing momentum around the upcoming unity referendum. The criticism of An Taoiseach Leo Varadkar by the British Secretary of State and a range of unionist voices for daring to suggest that a united Ireland will happen in his lifetime is the latest example of unionist and Tory efforts to delegitimise the goal of Irish unity.