You can't shake your working class psychology very easily.... I also eat crisp sandwiches (chips are called crisps over here) and I won't take the bus anywhere if I can walk there within half an hour - a taxi? No chance.
I don't answer the phone if I don't know who's calling and even though I have a bit of money in savings, I start to get anxious if my current bank balance goes below a certain point. So much so that I'll move money out of savings temporarily to convince myself I'm not going to die. I also have a pathological aversion to borrowing money from other people.
Most of the time i can function quite well, but occasionally I'll get frozen in a shop because there will be something I want and a cheaper version available. Sometimes for the sake of 50p I will spend ten minutes trying to decide if I can justify it. The significant other penguin has learned to spot it. The significant other penguin has also learned in a social situation I will offer to pay for other people's drinks or food even if I can't really afford to because I don't want anyone to think I'm cheap.
What fun we have unravelling the psychology of our childhoods. :o)