Not sure what I am doing wrong here. Have I missed some punctuation or am I just not using While correctly?

Scriptname LoopScene extends QuestInt Property p Auto  While getstage() == 40         If (game.getplayer().GetDistance(Alias_Marker) >=150)             p=1         EndifEndWhile While p==1          If (game.getplayer().GetDistance(Alias_Marker) <=50)             InnScene.Start()              p=0         EndIfEndWhile  

Most anything you do with Papyrus, including while loops, must be within events/functions. You'll want to find appropriate events to trigger stage setting/scene starting in which case you'll find you don't need while loops.

The scene starts at stage 30. At the end of the scene the stage is set to 40. I want the player to have a choice of starting the scene again, when they move towards the marker. But they will already be at the marker at the end of the scene. So I need to only trigger the scene if they walk away from the marker and then decide to walk back to it.

I will have another look at functions and events on the creation kit wiki and be back.

You don't need that script to trigger the scene just add conditions stack in your scene.

I'm not sure what conditions I would add.

I have managed to get the script to compile and I've added a function (thank you JustinOther!)

Scriptname aaaLoopScene extends Quest　　 Int Property p Auto  ReferenceAlias Property Marker Auto  Scene Property InnScene Auto Function StartLoop()               If (getstage() ==40)                     RegisterForSingleUpdate(1.0)               EndIfEndFunction Event OnUpdate()           If (game.getplayer().GetDistance(Marker.GetRef()) >=150)               p=1           Else               RegisterForSingleUpdate(1.0)                     If (game.getplayer().GetDistance(Marker.GetRef()) <=50 && p==1)                          p=0                         InnScene.Start()                     Endif            EndIFEndEvent 

I am hoping that with this script at the end of the InnScene (which has already played) if the player stays near the marker nothing will happen, but if the player walks away from the marker and decides to go back to the marker the scene will play again?

sigil79: Download my mod (http://skyrim.nexusmods.com/mods/30506 - It needs Lanterns of Skyrim mod too), open in CK and check the scenes. All the scenes have conditions based on distance.