I agree Hopkirk. I just have around 6 years with of p60s, and i only keep those because I have so many employers/small pension income sources and so tax affairs are not as straightforward as when someone has just one employer
"Even 10 year old P60s have little point in being kept."
Considering events of the past week or so, I expect there are a number of the 'Windrush Generation' who would love to have a series of payslips or P60s dating back to the early 1970s.