The threat of a sustained high altitude campaign by the "Luftwaffe" did not materialise and, more often than not, the Spitfire VIs were used at lower altitudes where it was outperformed by conventional Spitfires.
The threat of a sustained high altitude campaign by the "Luftwaffe" did not materialise and only 100 of the Mk VIs were built by Supermarine. More often than not, the Spitfire VIs were used at lower altitudes where it was outperformed by conventional Spitfires.