Rolls Royce were never concerned about reliability because of the soft nature of UK rock, engine failure in UK skies rarely causes anything worse than a bumpy landing. Venturing outside of the UK where the ground is hard would require a Packard engine.
Prince of Wales and the Silver Spitfire happened to be in our country on the same dates. Very impressive moments for us.
Would have been a good time to have for the prince if encountered too.