Oooh I love this thread - my posh MIL drives me up the wall - toilit and choclit of course, also fammlee (family) and proplee (properly). She also adds non-existent extra ts into "it isn't"/ "isn't it" so that they come out as "isn't tit" or it tisn't - aaaaaarrrrrrrggggghhhhhh
I once worked with someone who said pacific instead of specific, and pronounce automobile "or-to-mob-i-lay" ! (and not as a joke - that's what she thought it was). This was in a publishing comapny and she was a book editor! The same woman had to be off work with burns after trying to iron her jumper while wearing it - so she was a bit odd...