Play video with ARKit

I'm trying to place a Quad in 3D space and play a video on it.

I have set up my AR scene using the ARKit sample scene.

The Quad is placed when I tap the screen and I can move it about.

I don't want the video to Play on Awake, as the User may not have placed it yet, so I want it to start playing once they tap the screen to place the Quad.

The video is a 26sec 720p video playing from a URL that is my Amazon Server.

With the script I'm currently using, my Debug log will continually say "Preparing Video", whereas if I have it Play On Awake, it plays almost instantly.

 using System;
 using System.Collections.Generic;
 using System.Collections;
 using UnityEngine;
 using UnityEngine.Networking;
 using UnityEngine.Video;
 
 namespace UnityEngine.XR.iOS
 {
     public class UnityARHitTestExample : MonoBehaviour
     {
         public Transform m_HitTransform;
         public GameObject video;
 
         bool HitTestWithResultType (ARPoint point, ARHitTestResultType resultTypes)
         {
             List<ARHitTestResult> hitResults = UnityARSessionNativeInterface.GetARSessionNativeInterface ().HitTest (point, resultTypes);
             if (hitResults.Count > 0) {
                 foreach (var hitResult in hitResults) {
                     Debug.Log ("Got hit!");
                     m_HitTransform.position = UnityARMatrixOps.GetPosition (hitResult.worldTransform);
                     m_HitTransform.rotation = UnityARMatrixOps.GetRotation (hitResult.worldTransform);
                     Debug.Log (string.Format ("x:{0:0.######} y:{1:0.######} z:{2:0.######}", m_HitTransform.position.x, m_HitTransform.position.y, m_HitTransform.position.z));
                     return true;
                 }
             }
             return false;
         }
     void Start(){
         video.SetActive(false);
        
     }
         // Update is called once per frame
         void Update () {
             if (Input.touchCount > 0 && m_HitTransform != null)
             {
                  video.SetActive(true);
                 StartCoroutine(StartVid());
 
                 var touch = Input.GetTouch(0);
                 if (touch.phase == TouchPhase.Began || touch.phase == TouchPhase.Moved)
                 {
                     var screenPosition = Camera.main.ScreenToViewportPoint(touch.position);
                     ARPoint point = new ARPoint {
                         x = screenPosition.x,
                         y = screenPosition.y
                         
                     };
             
             
                     // prioritize reults types
                     ARHitTestResultType[] resultTypes = {
                         ARHitTestResultType.ARHitTestResultTypeExistingPlaneUsingExtent, 
                         // if you want to use infinite planes use this:
                         //ARHitTestResultType.ARHitTestResultTypeExistingPlane,
                         ARHitTestResultType.ARHitTestResultTypeHorizontalPlane, 
                         ARHitTestResultType.ARHitTestResultTypeFeaturePoint
                     }; 
                     
                     foreach (ARHitTestResultType resultType in resultTypes)
                     {
                         if (HitTestWithResultType (point, resultType))
                         {
                             return;
                         }
                     }
                 }
          
             }
             }
             IEnumerator StartVid(){
                 
                 video.GetComponent<VideoPlayer>().Prepare ();
  
          //Wait until video is prepared
          while (!video.GetComponent<VideoPlayer>().isPrepared) {
              Debug.Log ("Preparing Video");
              yield return null;
          }
          Debug.Log ("Done Preparing Video");
 
                     video.GetComponent<VideoPlayer>().Play();
                     Debug.Log("PLAYING VIDEO");
                 }
                 
             }
         }

Im hoping I've just missed something simple!

Can anyone help me out please?