UK is closest to France right around where the Channel Tunnel is: roughly Dover to Calais. That distance is 32km, as it says in the hint column.
I'm not sure where you think Ireland comes within 250km of a mainland?? The closest I can get is a bit south of Rosslare Harbour in County Wexford, to a point northwest of Tourlaville in Normandie, France, which clocks in at 413km.
There may be some outlying Irish Islands that let you get a bit closer, but I can't see it coming under 250km...
I'm not sure where you think Ireland comes within 250km of a mainland?? The closest I can get is a bit south of Rosslare Harbour in County Wexford, to a point northwest of Tourlaville in Normandie, France, which clocks in at 413km.
There may be some outlying Irish Islands that let you get a bit closer, but I can't see it coming under 250km...