From CAP 413
The averaging period for wind observations is two minutes for reports used at an aerodrome for take-off and landing and for wind indicators in air traffic service units. The instantaneous surface wind should be available to be given to pilots on request particularly at aerodromes supporting primarily the operations of aircraft whose maximum total weight authorised is 5,700 kg or less. When a pilot requests the instantaneous surface wind, the word "instant" is to be inserted to indicate that the wind being reported is not the two minute average.
That said the phraseology in CAP 413 for both AFISO and AG just show "Surface Wind".