I don't fink people in Romford, say, are genetically predisposed to be unable to pronounce their 'th's... lol
I'm not talking about whether or not people
can pronounce certain things, I'm just pointing out that in some areas (like oop 'ere in Yorksher, flower), the dialect has evolved so that certain words are said a certain way. I often say 'watter' instead of 'water' or 'dooroil' instead of 'doorway' and I often drop my aitches and resort to 'nowts' and 'summats'. Of course, I could speak properly if I wanted to. I could put on my telephone voice...lol.
I understand what you mean about people from other countries being unable to pronounce some English words as we do, though. I recall our Egyptian guide showing us the 'byramids'.
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www.mercuryrapids.co.uk]
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www.ufodata.co.uk]