Thanks for all your points they are of great help esp. SR.
MustafaG. what you are saying about a "long runway" and a low V1 on a light aircraft is exactly my point. V1 is there to in effect take any decission away from the pilot and commit you to getting in the air. There are cases in the RTOW where V1 is only just over VMCG and the airfield is huge. It seems daft to me that you may well be commited and yet have ample room to abort safely.
Dont get me wrong I do it by the book V1 I go, no doubt about it just wondering about the in's and outs of it.
Thanks Guys& Gals