at the ambulance spot the problem seemed to be that everytime i spawned there I got shot in the back promptly 
Yup, that's the idea ;D
But seriously, folks ... the enemy are advancing across open ground and they don't know you're there till you give them the good news. Hit the dirt immediately the mission starts (good advice for all starting points).
deaddog - I was worried something like this might happen. I intended to use only BIS addons and Kegetys .... Here's the list of addons from the mission.sqs
   "G36a",
      "XMS",
      "Steyr",
      "6G30",
      "AH64",
      "bis_resistance",
      "Bradley",
      "editorupdate102",
      "objects1",
      "BRDM",
      "CoupeR",
      "gcessna",
      "CoupeB",
      "SkodaE1",
      "su25b",
      "Kolo",
      "BMP2"
   };
   addOnsAuto[]=
   {
      "G36a",
      "XMS",
      "Steyr",
      "Bradley",
      "AH64",
      "bis_resistance",
      "6G30",
      "BRDM",
      "CoupeR",
      "gcessna",
      "CoupeB",
      "SkodaE1",
      "su25b",
      "Kolo",
      "BMP2",
      "editorupdate102",
      "objects1"
I'm not even sure what they all are - there's no cessna in the mission so what's that doing there? They are all just scenary so I'll take the problem ones out .... once I know what they are. Gunslingers addon isn't in my addon folder (checks ... AH-HA! I seems I have Gunslingers editor upgrade in my ordinary addons folder and Kegetys editor update in the Resy addons folder ...
Right, I'm going off to see if I can fixt this.