Talking about separations, how do you answer this. When I was a controller the MATS Pt 1 stated that for a light aircraft to follow a heavy aircraft on final approach the vortex spacing has to be 8 miles. However for an en route or intermediate approach a light can be 5 miles behind a heavy. Doesn't this contradict its self. How can you have 2 different rules.
Fly a lot into EGLL & EGKK now and the vortex spacings are not a problem, but again my question is how does the MATS Pt1 state different rules and EGLL have different rules.