I’m all for separated bike lanes etc. They’re nicer and safer than riding on the road. however when that doesn’t exist the safest way to ride is to behave like a car, so holding the leave etc. Otherwise people try to squeeze past you or your less visible and it gets really dangerous

I’m from Australia and wouldn’t have been able to confidently say there wasn’t a tunnel between Ireland and England. There are long tunnels in a few places and one there wouldn’t be too surprising to me