Hi Jan,
As indicated, I flew from Cambridge to Midden Zeeland last year in July, I rang the airport a few days in advance to clarify because I was coming from the UK and wanted to clear customs and have passport checked due to non Schengen, the person on duty said "give us a call before you leave UK giving us an ETA and we'll organise everything". Did so, landed and two officers inspected our passports and then let us be on our way, flew back to Germany from there. This is "from the horses mouth", from one who's done the trip before.....