WAV, having been exposed to British and Aussie accents since childhood (the world truly being multicultural) I must say that had you not LOUDLY proclaimed your Englishness, then I would never have guessed it from your accent.

I've listened to hours upon hours of various british accents, more than you, probably, often just to LEARN about the various accents, but my accent is not English. Just isn't.

In speaking a foreign language I try to mimic the sounds as closely as possible, but I still don't sound Russian. Polish, Ukrainian, Odessan and son of Russian immigrants is closest I've got.