There was a BBC article a few months back which I believe was titled "how to live off £20,000 a year once you retire". The answer was to start saving young and put X towards your pension per week/month.
I can't remember what X was but I felt it was quite high given how poor wages are for many young people and how expensive rent is. I certainly could not afford it.
And all before Brexit kicks in....
i looked at a private pension when i hit 40, i was going to have to put in just over £470 a month to make it worthwhile
£470 a month, thats way out of my range, i would prefer to live now and spend it