The trouble with ‘haitch’ is that in English it is a marker of an uneducated person, rightly or wrongly. Non-conformity is one thing; putting a person at a social disadvantage is another, which careful teaching can avoid.
Here's another: sixth pronounced sikth - I hear it all the time on TV and radio, including Jeremy Paxman on Uni Challenge. He really should know better.
Oh, and people beginning the answer to every question with "so........."
You've really got me going now. Hate people calling Tesco, Tesco's. Even in the fictional world of Weatherfield I shout at the screen when I hear someone refer to 'Freshco's': it's not 'Freshco's' - like Tesco, it's Freshco!
My grandmother always used to say "aks" for "ask" - an old Lancastrian who died in 1963, so I don't think it's an import. There are lots of words that some people get back-to-front or muddled; it's just one of those things. Dad always said "artitect" for "architect".
Any time I go into a WH Smith I wonder how it hasn't long ago gone the way of Woolworth - it's like stepping back into the 1970's, and even has the same smell I remember from back then. How does it survive?