EDIT: I deleted the original video and have replaced it with the final version here after all the help and editing. 22.02.15
I have played this before but not in the original alternate tuning which Justin Hayward actually uses. This time I am using the DADFAC tuning (and I am back to standard reference of A=440 Hz here). I am making progress on my strumming with a pick, which is fun. Singing is a bit wonky as I am focussing on the playing

Maybe someone can help me, this is driving me CRAZY! I cannot work out exactly what Justin is doing on this strum. By the 3rd or 4th bar, I am already out of sync! I have an approximation which seems to work well enough but I know it isn't right and I really would like to get it exactly right. Maybe its just the hammer on which is throwing me because on the run and coming out of the run I seem to be in time. But I am also throwing in the odd stroke or two for no good reason. This comes from me learning by ear and trying to get what I am hearing without counting beats (which completely throws me... especially when trying to sing at the same time). The result is, it looks like I can play this song but I am incapable of playing this along with Justin in his video (below) or with a "gnome". I would so much like to get beyond this and finally feel like I am in real control. Can anyone tell me exactly what it is Justin is doing... if you can work out just the first few bars, it will help!
Also below is the video I learned this song from (hope its ok to post, he's not just a fellow Youtuber not a competing teacher/website).
Chris