london ireland want re-assurance britain regulatory divergence northern ireland brexit foreign minister simon coveney tell bbc radio friday say ireland want achieve dec. 14 eu summit agree word whereby agree parameters within find solution prevent re-emergence border island ireland avoid so-called hard border island ireland last major hurdle brexit talk move negotiations britain future trade relationship eu possible two-year brexit transition deal coveney say ireland ask leap dark uk ireland say want 'agreed word brexit border december 14 summit