It's very unusual because despite trying to search all over the place I just can't find the programmes.
BTW these would all be around the 1988-1994 time - I think.
Show 1:
Clue 1: Group of kids, living in a resort\holiday island in the Carribbean (I think) who solved mysteries like kids do.
Clue 2: The main kid had an American accent, and Pat Cash style hair style. His father owned the hotel I think.
Clue 3: The main adult who I think managed the hotel, was a British actor with white hair (still does). I'm positive he has\had regular appearances in ChuckleVision but the IMDB list is almost impossible to go through.
Clue 4: I remember watching it on ITV on Saturday morning and was part of a bigger programme. It was being presented by one guy stuck in a room barely bigger than the BBC's broom cupboard.
Solved! It was Runaway Bay! (At 0:20 you see the ChuckleVision guy!)
Show 2:
Clue 1: 3 Servants, 2 male and 1 female - Don't think it was "You Rang, M'Lord?" I think they were dressed in Your rang my lord-esque style
Clue 2: They were tiny people - Don't think it was Land of the Giants or The Borrowers.
Clue 3: I remember then hiding behind a pillar and trying to sneak onto a steam train on one episode. (swear I didn't dream this!)
Solved! We think it's "The return of ther Antelope"
Show 3:
Clue 1: Based around the time of the Ancient Olympics and set in Greece, it was about a roup of kids who go on a quest to find rings or something.
Clue 2: This was definitely on the BBC, I reckon just before the Barcelona 1992 Olympics.
Clue 3: It may have been dubbed.
There we have it, have I jogged your memories? It would be amazing if you can help
Show 4: (requested by IBM)
Dubbed, about a kid who sold his laugh in exchange for the granting of any wish he could think of. Pretty sure it was german, and the bad guy lived in a very cool house on the inside of an island volcano. I must have watched it in the late 80s.