Thanks Hamphisted for clearing that up for me.
Flyingforfun, I believe the 1000' refers to:
If there is no outer marker or equivalent postion then the commander, if the reported RVR is below minima, can not descend past 1000ft above AAL. If the aircraft is already past the outer marker / equivalent point or 1000' feet in the formers abscence and the reported RVR falls below minima then the aircraft can continue the approach and if suitable visual is aquired, can land perfecfly legally.
I may be wrong though as this is all pretty new to me.
Thanks again guys for your input.