Customs
Yes, you do have to clear customs in Le Touquet or Deauville first.
Dieppe is good too, but beware: Hard runway, grass taxiway.... where I got stuck a couple of weeks ago. Had to call in another a/c from Bernay with 3 onboard to get me out. I did not read the b****y NOTAM (nor did the other 5 a/c that go stuck that same week end!