Steve6443, if it is Midden Zeeland EHMZ you mean, one can have customs there through prior notice; but immigration is not available so it cannot serve for flights from/to non-Schengen territory like the UK.
This is strange because I flew from Cambridge last July and cleared immigration / customs at Middenzee - I rang Middenzee before boarding the aircraft and the customs / immigration were there to "meet and greet" us when we landed.....