We often hear southerners talking about how the correct way to say words with "ath" is the "ar" sound, rather than the "a" sound that's common up north. E.g. barth, carstle, grarss. But is it really the correct way? The South East biased media think so, but these links suggest otherwise:

[url="http://lairdofglencairn.spaces.live.com/Blog/cns!FA29A59CC6777652!3323.entry"]http://lairdofglencairn.spaces.live.com/Bl...!3323.entry[/url]
[url="http://digitalspy.co.uk/forums/showthread.php?t=837551&page=2"]http://digitalspy.co.uk/forums/showthread....7551&page=2[/url]

Yes, the "r" pronounciation only came into being up to a few hundred years ago as a dialect around London, which then spread to the rest of southern England.

So if there is a "correct" way of saying it, it's actually the northern way! Although I personally prefer to think of there not being a "correct" way, but rather a difference of dialect/opinion.

Howay man!