Professor John Doyle:

Politically, it is very challenging in a power-sharing structure where effectively all-party agreement is needed.

There is the industrial policy piece in terms of addressing FDI. That is fundamentally linked to political and market stability and those are challenging. The UK Government sets corporation tax, the regulatory framework and negotiations with the EU. These could be resolved without constitutional change but they are very challenging and. therefore, the planning needs to assume a range of scenarios from closing convergence, which would be the ideal, but also the possibility that it could look very similar to today, at the moment, for a border poll.