Nota - Anything from 15-6 miles.
Technique we mostly use. 160 F2 (watching ND to see how quickly to achieve it....If you are already 2.5nm behind when told to reduce - Speed back quick!)
At 4.5d, managed speed. All that happens is the engines wind down to idle. 160kt normally maintained.
At 4d, gear/F3 then flap full quite quickly. As the gear comes down it creates additional drag which helps slow down. Generally achieve Vapp with (some) power at 1000'. Light A319's take a bit more!
Okivan's technique works, but creates additional noise to 4d, also as there is so much power on at 4nm the engines will take a while to wind down again and slow down.