Granted, this is from a 1970s TV series called "Secret Army" but it is apparently based off of real events. Is this a real medal, and if so, can you tell me what it is? It may be Belgian or British, as the man holding it was Belgian working for London.
That's the Belgian War Cross. It was given to soldiers and civilians for showing bravery in actions against the enemy.
On second sight: some things are off. The cross is not exactly the same (http://imgur.com/a/bx1om) and the middle figure should be a rampant lion or the Kings sigil (two stylised L's with a roman numeral 3). So it's likely a prop based on the War Cross.
If you don't get a satisfactory answer here, you could try r/whatisthisthing.