Snowy Astra, Lorient is in Brittanny, nowhere near luxembourg

You should be able to catch a ferry from Plymouth(I think) to Roscoff then drive to lorient - Approx. 100 miles.
Or, catch a ferry in portsmouth to saint malo, that's 130miles or so.

Lorient has an airport, not sure who flies there though
Alternatives for flying would be Rennes, Brest and Quimper.