I see what IB is saying, and he is right: nowadays, in common English usage, especially in UK standard English, "the fiddle" means the violin. That is what the dictionary should, and indeed does, list as the primary definition.   

Some of the caveats, which IB acknowledges, and which WAB thinks are quite important, are

(1) this has not always been the case (the word "fiddle" being older than the violin)

(2) music specialists use "fiddle" in a broader sense to mean "bowed lute," so from this perspective there are many "fiddles" in many different cultures.

So, does anyone still disagree? If so, how does it affect our wider discussion of musical Englishness and English musicality ?