Originally Posted by
wiggy
[...]
...then at some point you’ll get told to reduce to “160 to 4 DME”...and FWIW the other gotcha now at LHR is with Time Based Separation ATC really do mean 160 IAS until you hit 4 DME...not before.
The next problem for ATC can arise inside 4 DME, particularly when there's a very strong headwind on the approach but a moderate one on the runway with, for example, an A320 following a B737/757. The Boeing will be flying purely on Vref plus an increment for the wind, whereas the A320 will be using GS MINI and is therefore likely to start catching it up.