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So Lughaidh when you speak English do you speak it with a London accent?
I'd like to speak it with an Irish accent

But I don't have any opportunity to practise it, and to me, speaking perfect English isn't as important as speaking perfect Irish and perfect Breton

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You can speak Irish with any accent from Ireland as long as the phonology and prononciation is right, it works with any accent from Ireland because its Irish. It wouldn't work someone speaking Irish with an Italian accent with the sounds, because its foreign.
Theres blas na Gaeltachta, and blas na Gaeilge(ie, right prononciation no English influenced) and then theres just bad urban pronunciation of Irish.
I've met speakers from Down, Dublin who speak Irish in their own accent but their pronunciation, phonology sounds native but in their own accent. Theres a difference between an accent and prononciation.
that depends on the meaning of "accent" to you. Accent in the sense you mean it, isn't really a scientific term. Looks like "accent" more or less means "(local) pronunciation", for most people. That's the problem. In linguistics we talk about phonetics, phonology, phonotactics, prosody... etc. If I understand properly, to you "accent" is what we call "prosody" in linguistics:
http://en.wikipedia.org/wiki/Prosody_%28linguistics%29 When you say people should keep their Galltacht accent when speaking Irish, although they have to use the real sounds, you imply, for instance, that the accent Dubliners have in English now, is the same as the accent the Irish speakers had when Irish was the common language in Dublin area. but we have no idea if it's true or not, that's the problem... we can't verify.
But you're right when saying that what counts most is the sounds (consonants, vowels etc).