Oh dear....back to that old chestnut LTNMan!
You obviously haven't read or understood the theory behind balanced field take-off's.....So here's a link explaining it pretty clearly:
Yes I have read the link but put simply when an easyjet aircraft back tracks at Luton or any aircraft come to that, it is normally airborne by the 08 turn off and when it takes off from the intersection it usually isn’t. That to me tells me whether correctly or not that the V1 point is further down the runway so giving less time to reject the take-off.
I concede to your superior knowledge on the subject but I just see things in black and white. I do wonder though if pilots knew in advance that an engine was going to fail on a take-off run would they still depart from the intersection or use the full length? Maybe you could answer that question as you imply it makes no difference?