No passengers and not going landside I was only charged landing, although I probably should have been charged for immigration. Midweek the GA terminal was locked and deserted, but someone drove over after I called using the phone next to the door. She also gave me lift back to the plane, maybe 10 metres :) Apart from this small delay it's a perfect airport for passing the Schengen border. I had emailed the previous day for immigration, and paid by card the day after, so it could have been completely contactless. Apparently there's a shuttle that goes into Lille regularly.