I hate how the BBC portrayed Mist's mum as thick as mince who gets all the sayings ridiculously wrong. I thought as a doctor you will happily care for any patient regardless of their IQ or class but seeing that Adam Kay wrote those despicable lyrics about babies with Downs and also about Northern women, he is a sneery entitled prick with huge mummy issues so no surprise there.
His mum was probably rather nice but had her hands full with tricky Adam boy. I mean he must have been a slouching, can't be arsed so and so if his mum still had to remind him to stand straight when he went for his shift at the private maternity hospital. And did he really shag the porter there? 
That's pretty messed up behaviour.
Back to the point about how Mist's mum was portrayed. Funny that the focus was on how uneducated she seemingly was rather than on his mistake.
The BBC certainly took the opportunity to focus on his gay relationship, which was not much of a topic in the books, probably a target audience thing.
I know males like AK, so friggin convinced of their inherent intellectual superiority over others. They make me laugh because every single time, it's this type of entitled male who just does not measure up, they are the ones who fail, crash and burn again and again. Why? Because they are too busy being incredibly smug about how clever they are, which funnily, they really are not. It's good old fashioned male arrogance mixed with a lack of social skills.