I'm honestly not sure which side he was on at this point. It was a while back, obviously. As fir the rest, well, it's disheartening how many UK folks don't seem to make the connection that leaving the European Union means that they're leaving the European Union and will therefore need to make deals with EU members like a nation that isn't part of the European Union.
(insert shrug and/or facepalm emoji here)
(insert shrug and/or facepalm emoji here)