Jenifer (Zarknorph) said:

Members of Northern Ireland's two largest pro-British parties are set to take part in legal action challenging part of Britain's divorce deal with the European Union, the parties said on Sunday.

An interesting move. I guess if the courts support the challenge, then the UK Gov will have no alternative but to end the isolation of NI and treat NI as part of the UK. That would mean that the EU would impose a land border and customs posts between NI and the Republic which would have interesting consequences.