There's no scientific index for the measurement of such an attribute, but realistically given Britain's level of military development compared to other world nations the only true argument could be over whether it is infact still superior to the French armed forces.
So 4th or 5th.
Given the superior quality of Britain's non-combat sector and logistical network, as well as the quality of the equipment they use, I personally would rate Britain above France although the gap is narrowing.
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