Oh thanks John, i was thinking i read for 30min then go to bed, 1.5hrs later… haha, that included the La+ threshold, the last maybe 15 posts on there as-well. Had to re-read some very good posts by Charlie - esp great was the SE - How Intensive tempo AND SE can be seen as different entities due to Recoverys.
I read that, and the SE become all too clear. It’s exactly how i train Endurance athletes.
Previously it was getting confusing how i could implement the CF style of training into 800m +.
However, It’s no different to how i do it anyway.
The confusing part was Intensive tempo limits. I had always thought he meant the Individual segment. Then entire Block of efforts though, that’s a different ball game. Cleared up a lot - Thanks CF 
and thanks John for a great find.