Northern Ireland (Executive Formation and Exercise of Functions) Bill

In relation to Brexit and the Secretary of State’s guidance following this legislation, would it not be helpful for the Secretary of State to look back at the letter signed—if my memory serves me correctly—on 13 August 2016, just months after the referendum, by both the then First Minister Arlene Foster and the then Deputy First Minister, the late Martin McGuinness? Would not that be helpful in showing the priorities that the then First Minister and Deputy First Minister felt were relevant in the Brexit negotiations?