Excellent! Great find. I was allowed to have a close look at this aircraft back in February, but to see - and hear, it running - fantastic!
I understand what you mean Jim, and there is always a risk with such things, but the guys at St.Athan are the guys who restored her, regular RAF specialists, among the best there are, so I think they would have been confident of the safety aspects before risking even turning over an engine.
Having had a close look at the engines and engine bays, they did a superb job - everything is spotless.