IIRC many BAe146 operators used wet data only, or at least were encouraged to use wet V1s for every take off; the data was supplied by the manufacturer.
On refection it might have had more to do with a very small V1/Vr speed range (generally low Vrs) and the thickness of the two plastic bugs on the ASI (approx 5 kts); thus the calls became a smooth flow of “V1, Rotate”.