after my start as a PPL i did a weekend tour Norwich-Rotterdam-Brussels-Dahlemer Binz-Luxemburg-Charlesvile- Brussels- Rotterdam-Norwich. Full immersion as a way to loosen up on international flight.
The one which stood out was Dahlemer Binz, a german airfield with a good tarmac runway just east of the Belgian Ardennes in fab countryside (also en route).
Not sure if they have customs there, remember Europe is now mainly Schengen, so you may have to land at Oostende on your way down there
(Closer by you could go to Midden Zeeland or Texel, both grass strips in good condition)