Hipper. The Valiant Tankers had a working water injection system, we called it water-meth but maybe that is water-ethanol?. If I remember correctly it was 60% water and 40% the other. Our Avons were rated at 10,000lbs static thrust and water gave us another 1,000 lbs. We used it frequently if we were hot, high and heavy. It lasted about 40 seconds. One disadvantage was to a stream take-off where subsequent aircraft found themselves virtually IMC from the smoky exhaust. Its use also reduced engine life between overhauls but it was very welcome since in those days we often took off with Stop the wrong side of Go [as we called them then]. I am not aware of any of the other Vs being so equipped.