Let me tell you this;
In 1975 I earned 26p an hour
In 1976 I earned 37p an hour
In 1977 I earned 43p an hour
In 1978 I earned 54p an hour
In 1979 I earned 94p an hour
In 1980 I earned over a £pound an hour
So! I put it to you, in 1980 I was earning just over a £ an hour, a working week was usually 45hours after tax and NI I probably was taking home around £35 a week.
How long do you think it would have taken to buy a Kawasaki z900?
Remember my 1 bedroomed flat cost £10 per week, gas and leccy was probably £4 a week
Food shopping for the family.... £10
You have no idea

we were poor as buggery back then, everyone was.
I forgot, the wife got £2.40 family allowance each week for my first child.