Well I’ve never lived in the midlands so I couldn’t say what people speak like there, but phonics, again, are standardised:
Book pronounced with an ‘uh’ sound, for example, would sound like buck as in a deer.
However I’m not going to argue - I’ve no skin in the game, and really don’t care. I’m simply explaining since people keep asking. And I’m not lecturing anyone on how they should speak, or saying they’re wrong, either, if it’s come across like I am. I’m discussing it because it’s relevant to the general discussion about the name, that’s all. As far as I’m concerned it’s all part of the fascination of this fantastic language!