Brummie accent? In Coventry? Oh dear.
This takes me to a tale told by a good friend of mine from Coventry. She was an engineering student (probably at roughly the same time that "This Town" is set, or a bit before). By her own admission she has never been much good at geography. Anyway, she was on a placement at a foundry somewhere in the Black Country. Dudley or somewhere like that. She was having difficulty understanding what people were saying, there was a big molten metal spill and a lot of yelling. "I thought they were talking Welsh. I must have gone all the way to Wales" (What did I say about not being very good at geography?)
Accents in the Midlands are a bit of a nightmare. Mind you that's probably true of most places. Imagine something set in Manchester, but involving scenes in Liverpool and Bolton.