Groundpeed mini
I am surprised that no mention of "Groundspeed Mini" function fitted to all Airbus has not been mentioned, as this automatically increases the Vref approach airspeed so as to maintain a constant groundspeed, regardless of approach headwind.
The only problems when using this function are the large power reductions which can happen close to the ground, as headwind reduces, and the danger of a flap overspeed, if speed momentarily increases in high wind turbulence.
The problem with selecting this function "off" using "selected" Vref is that automatic speed targets in the event of a go-around are lost.
Unfortunately the benefits of GS Mini are useless unless all aircraft are using it at the same time, so for Heathrow, selected Vref for most of the approach is the norm.
Hope this is some help.