del prado,
The post, was directly from the document by Paul Johnston, Application of wake turbulence at London Heathrow, read the document link...
https://docs.google.com/viewer?url=h...ul_Johnson.pdf
UK already has a difference to ICAO as I described above (wake separation to 4 dme not threshold)
that is not what is stated in the document...
I placed the red box over the text....
.. applied to 4DME
FROM touchdown