The insurance thing doesn't always work as others have already said. Also, the cash back thing.
It does always work though if you are paying for goods between £100 and £30,000 as others have already said. Those that think it doesn't work either don't have a credit card or they are taking about a circumstance when the consumer credit does not apply.
Most cards give a real pittance so unless you are spending a LOT on your card, the amount you get back is really negligible. To get one that gives decent cash back, you have to pay a monthly fee (such as Amex, which a lot of places won't accept) which negates what you earn on cash back.
Not true at all. I only pay a yearly fee to Amex and it is much less than the cashback even taking into account that not everywhere accepts it. Other cards don't charge any fee and whilst the rewards are not that huge, turning down a a few hundred pounds a year because you are scared of debt does not actually suggest that you are good at managing money.
I used to work in financial services btw, and know all about cards.
Obviously not based on what you have stated. Perhaps your knowledge is out of date.
Oh, "ridiculously poor" is obviously in comparison at the time. We didn't know anyone else without a phone and I never had any new clothes bar school uniform once I went to secondary school. Everything was jumble sales (whatever happened to those?).
You must have lived in quite a well off area then because even in 1984, not having a landline was not unusual. It cost quite a bit to put one in. I didn't have one until the 90s.