Any WW2 RAF experts?

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So how far could the gap be? A Mk.I and a Mk.XIV are very different aircraft performance wise, surely they would never get used together? or would they?

Are you saying that the older models would be retrofitted with upgrades to the new standards whenever possible? I know many Mk.I's were upgraded to the Mk.V standard

I was just wondering did griffon and merlin powered models serve in the same units?